Caspian Sea

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Caspian Sea
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|type = Endorheic, saline, permanent, naturalVolga River, Ural River, Kura (Caspian Sea)>Kura River, Terek RiverEvaporation, Garabogazköl>Kara-Bogaz-Gol3626000sqmi|abbr=on}}|basin_countries = Azerbaijan, Iran, Kazakhstan, Russia, Turkmenistan1030miabbr=on}}435miabbr=on}}371000sqmiabbr=on}}211-1|abbr=on}}1025-1|abbr=on}}78200cumiabbr=on}}|residence_time = 250 years7000miabbr=on}}-28ftabbr=on}}|frozen =26+)|islands_category = Islands of the Caspian SeaBaku (Azerbaijan), Rasht (Iran), Aktau>Aktaw (Kazakhstan), Makhachkala (Russia), Türkmenbaşy, Turkmenistan (Turkmenistan) (see #Cities near the Caspian Sea>article)|reference =van der Leeden, Troise, and Todd, eds., The Water Encyclopedia. Second Edition. Chelsea F.C., MI: Lewis Publishers, 1990, p. 196.}}The Caspian Sea is the world's largest inland body of water, variously classed as the world's largest lake or a full-fledged sea. It is an endorheic basin (a basin without outflows) located between Europe and Asia, to the east of the Caucasus Mountains and to the west of the broad steppe of Central Asia. The sea has a surface area of 371,000 km2 (143,200 sq mi) (excluding the detached lagoon of Garabogazköl) and a volume of 78,200 km3 (18,800 cu mi). It has a salinity of approximately 1.2% (12 g/l), about a third of the salinity of most seawater. It is bounded by Kazakhstan to the northeast, Russia to the northwest, Azerbaijan to the west, Iran to the south, and Turkmenistan to the southeast. The Caspian Sea is home to a wide range of species and may be best known for its caviar and oil industries. Pollution from the oil industry and dams on rivers draining into the Caspian Sea have had negative effects on the organisms living in the sea.The wide and endorheic Caspian Sea has a north–south orientation and its main freshwater inflow, the Volga River, enters at the shallow north end. Two deep basins occupy its central and southern areas. These lead to horizontal differences in temperature, salinity, and ecology. The Caspian Sea spreads out over nearly 750 miles (1,200 km) from north to south, with an average width of 200 miles (320 km). It covers a region of around 149,200 square miles (386,400 square km) and its surface is about 90 feet (27 meters) below sea level. The sea bed in the southern part reaches as low as 1,023 m (3,356 ft) below sea level, which is the second lowest natural depression on Earth after Lake Baikal (−1,180 m, −3,871 ft). The ancient inhabitants of its coast perceived the Caspian Sea as an ocean, probably because of its saltiness and large size.


The word Caspian is derived from the name of the Caspi, an ancient people who lived to the southwest of the sea in Transcaucasia.Caspian Sea {{Webarchive|url= |date=2008-01-07 }} in Encyclopædia Britannica. Strabo wrote that "to the country of the Albanians belongs also the territory called Caspiane, which was named after the Caspian tribe, as was also the sea; but the tribe has now disappeared".WEB,weblink Strabo. Geography. 11.3.1,, 2011-04-14,weblink" title="">weblink 2011-05-11, live, Moreover, the Caspian Gates, which is the name of a region in Iran's Tehran province, possibly indicates that they migrated to the south of the sea. The Iranian city of Qazvin shares the root of its name with that of the sea. In fact, the traditional Arabic name for the sea itself is Baḥr al-Qazwin (Sea of Qazvin).Iran (5th ed., 2008), by Andrew Burke and Mark Elliott, p. 28 {{webarchive|url= |date=2011-06-07 }}, Lonely Planet Publications, {{ISBN|978-1-74104-293-1}}In classical antiquity among Greeks and Persians it was called the Hyrcanian Ocean.Hyrcania {{Webarchive|url= |date=2011-06-04 }}. Retrieved 2012-05-20. In Persian middle age, as well as in modern Iran, it is known as , Daryā-e Khazar, which was named after Khazars an ancient nomadic tribe in the region. it is also sometimes referred to as Mazandaran Sea () in Iran.Drainage Basins – Caspian Sea {{Webarchive|url= |date=2016-03-03 }}. Retrieved 2012-05-20.Some Turkic peoples refer to the lake as Khazar Sea. In Turkmen, the name is , in Azeri, it is , and in modern Turkish, it is . In all these cases, the second word simply means "sea", and the first word refers to the historical Khazars who had a large empire based to the north of the Caspian Sea between the 7th and 10th centuries. Some other Turkic ethnic groups refer to the lake as Caspian Sea. In Kazakh, where it is called , Kaspiy teñizi, in Kyrgyz: Каспий деңизи (Kaspiy deñizi), in Uzbek: Kaspiy dengizi.Renaissance European maps labelled it as Abbacuch Sea (Oronce Fine's 1531 world map), Mar de Bachu (Ortellius' 1570 map), or Mar de Sala (Mercator's 1569 map).Old Russian sources call it the Khvalyn or Khvalis Sea (Хвалынское море / Хвалисское море) after the name of Khwarezmia.Max Vasmer, Etimologicheskii slovar' russkogo yazyka, Vol. IV (Moscow: Progress, 1973), p. 229. In modern Russian, it is called , Kaspiyskoye more.

Physical characteristics


The Caspian Sea, like the Black Sea, is a remnant of the ancient Paratethys Sea. Its seafloor is, therefore, a standard oceanic basalt and not a continental granite body. It became landlocked about 5.5 million years ago due to tectonic uplift and a fall in sea level. During warm and dry climatic periods, the landlocked sea almost dried up, depositing evaporitic sediments like halite that were covered by wind-blown deposits and were sealed off as an evaporite sink when cool, wet climates refilled the basin. (Comparable evaporite beds underlie the Mediterranean.) Due to the current inflow of fresh water in the north, the Caspian Sea water is almost fresh in its northern portions, getting more brackish toward the south. It is most saline on the Iranian shore, where the catchment basin contributes little flow.WEB,weblink Sea Facts, Casp Info, 2017-02-25,weblink" title="">weblink 2017-02-26, live, Currently, the mean salinity of the Caspian is one third that of Earth's oceans. The Garabogazköl embayment, which dried up when water flow from the main body of the Caspian was blocked in the 1980s but has since been restored, routinely exceeds oceanic salinity by a factor of 10.WEB,weblink Caspian Sea – Background, 2009, Caspian Environment Programme,weblink" title="">weblink 3 July 2013, dead, 11 September 2012,


(File:CaspianSeaDrainage v1.png|thumb|Area around the Caspian Sea. Yellow area indicates the (approximate) drainage area.)The Caspian Sea is the largest inland body of water in the world and accounts for 40 to 44% of the total (wikt:lacustrine|lacustrine) waters of the world.WEB,weblinkweblink" title="">weblink 2009-01-22, Caspian Sea, Iran Gazette, 2010-05-17, The coastlines of the Caspian are shared by Azerbaijan, Iran, Kazakhstan, Russia, and Turkmenistan. The Caspian is divided into three distinct physical regions: the Northern, Middle, and Southern Caspian.BOOK, Hooshang Amirahmadi, The Caspian Region at a Crossroad: Challenges of a New Frontier of Energy and Development,weblink 20 May 2012, 2000, Palgrave Macmillan, 978-0-312-22351-9, 112–,weblink" title="">weblink 28 May 2013, live, The Northern–Middle boundary is the Mangyshlak Threshold, which runs through Chechen Island and Cape Tiub-Karagan. The Middle–Southern boundary is the Apsheron Threshold, a sill of tectonic origin between the Eurasian continent and an oceanic remnant,JOURNAL, Khain V.E. Gadjiev A.N. Kengerli T.N., Tectonic origin of the Apsheron Threshold in the Caspian Sea, Doklady Earth Sciences, 414, 1, 2007, 552–556, 10.1134/S1028334X07040149, 2007DokES.414..552K, that runs through Zhiloi Island and Cape Kuuli.BOOK, Henri J. Dumont, Tamara A. Shiganova, Ulrich Niermann, Aquatic Invasions in the Black, Caspian, and Mediterranean Seas,weblink 20 May 2012, 2004, Springer, 978-1-4020-1869-5,weblink" title="">weblink 28 May 2013, live, The Garabogazköl Bay is the saline eastern inlet of the Caspian, which is part of Turkmenistan and at times has been a lake in its own right due to the isthmus that cuts it off from the Caspian.Differences between the three regions are dramatic. The Northern Caspian only includes the Caspian shelf,BOOK, A. G. Kostianoi and A. Kosarev, The Caspian Sea Environment,weblink 20 May 2012, 2005, Birkhäuser, 978-3-540-28281-5,weblink" title="">weblink 28 May 2013, live, and is very shallow; it accounts for less than 1% of the total water volume with an average depth of only {{convert|5|-|6|m|ft}}. The sea noticeably drops off towards the Middle Caspian, where the average depth is {{convert|190|m|ft|-1}}. The Southern Caspian is the deepest, with oceanic depths of over {{convert|1000|m|ft|-2}}, greatly exceeding the depth of other regional seas, such as the Persian Gulf. The Middle and Southern Caspian account for 33% and 66% of the total water volume, respectively. The northern portion of the Caspian Sea typically freezes in the winter, and in the coldest winters ice forms in the south as well.WEB,weblink News Azerbaijan,, 9 October 2015,weblink" title="">weblink 12 May 2013, live, Over 130 rivers provide inflow to the Caspian, with the Volga River being the largest. A second affluent, the Ural River, flows in from the north, and the Kura River flows into the sea from the west. In the past, the Amu Darya (Oxus) of Central Asia in the east often changed course to empty into the Caspian through a now-desiccated riverbed called the Uzboy River, as did the Syr Darya farther north. The Caspian also has several small islands; they are primarily located in the north and have a collective land area of roughly {{convert|2000|km2|mi2|abbr=on}}. Adjacent to the North Caspian is the Caspian Depression, a low-lying region {{convert|27|m|ft|0}} below sea level. The Central Asian steppes stretch across the northeast coast, while the Caucasus mountains hug the western shore. The biomes to both the north and east are characterized by cold, continental deserts. Conversely, the climate to the southwest and south are generally warm with uneven elevation due to a mix of highlands and mountain ranges; the drastic changes in climate alongside the Caspian have led to a great deal of biodiversity in the region.{{clear left}}The Caspian Sea has numerous islands throughout, all of them near the coasts; none in the deeper parts of the sea. Ogurja Ada is the largest island. The island is {{convert|37|km|0|abbr=on}} long, with gazelles roaming freely on it. In the North Caspian, the majority of the islands are small and uninhabited, like the Tyuleniy Archipelago, an Important Bird Area (IBA), although some of them have human settlements.


File:Caspian Sea Kazakhstan Mangistau.jpg|thumb|Caspian Sea near Aktau, Mangystau Region, KazakhstanKazakhstanThe Caspian has characteristics common to both seas and lakes. It is often listed as the world's largest lake, although it is not a freshwater lake. It contains about 3.5 times more water, by volume, than all five of North America's Great Lakes combined. The Caspian was once part of the Tethys Ocean, but became landlocked about 5.5 million years ago due to plate tectonics. The Volga River (about 80% of the inflow) and the Ural River discharge into the Caspian Sea, but it has no natural outflow other than by evaporation. Thus the Caspian ecosystem is a closed basin, with its own sea level history that is independent of the eustatic level of the world's oceans.The level of the Caspian has fallen and risen, often rapidly, many times over the centuries. Some Russian historians{{Who|date=May 2011}} claim that a medieval rising of the Caspian, perhaps caused by the Amu Darya changing its inflow to the Caspian from the 13th century to the 16th century, caused the coastal towns of Khazaria, such as Atil, to flood. In 2004, the water level was {{convert|28|m|abbr=off}} below sea level.Over the centuries, Caspian Sea levels have changed in synchrony with the estimated discharge of the Volga, which in turn depends on rainfall levels in its vast catchment basin. Precipitation is related to variations in the amount of North Atlantic depressions that reach the interior, and they in turn are affected by cycles of the North Atlantic oscillation. Thus levels in the Caspian Sea relate to atmospheric conditions in the North Atlantic, thousands of miles to the northwest.{{Citation needed|date=September 2010}}The last short-term sea-level cycle started with a sea-level fall of {{convert|3|m|0|abbr=on}} from 1929 to 1977, followed by a rise of {{convert|3|m|0|abbr=on}} from 1977 until 1995. Since then smaller oscillations have taken place.WEB,weblinkweblink" title="">weblink 2011-07-24, Welcome to the Caspian Sea Level Project Site,, 2010-05-17, A study by the Azerbaijan Academy of Sciences estimated that the level of the sea was dropping by more than six centimetres per year due to increased evaporation due to rising temperatures caused by climate change.

Environmental degradation

The Volga River, the largest in Europe, drains 20% of the European land area and is the source of 80% of the Caspian's inflow. Its lower reaches are heavily developed with numerous unregulated releases of chemical and biological pollutants. The UN Environment Programme warns that the Caspian "suffers from an enormous burden of pollution from oil extraction and refining, offshore oil fields, radioactive wastes from nuclear power plants and huge volumes of untreated sewage and industrial waste introduced mainly by the Volga River".NEWS, Caviar pool drains dry as Caspian Sea slides towards catastrophe,weblink 2019-04-18, The Nation, Agence France-Presse, 2019-04-18, Bangkok,weblink" title="">weblink 2019-04-17, live, The magnitude of fossil fuel extraction and transport activity in the Caspian also poses a risk to the environment. The island of Vulf off Baku, for example, has suffered ecological damage as a result of the petrochemical industry; this has significantly decreased the number of species of marine birds in the area. Existing and planned oil and gas pipelines under the sea further increase the potential threat to the environment.WEB,weblinkweblink dead, 13 April 2010, Caspian Environment Programme,, 30 October 2012,


File:Ghaleye Rud Khan (40) 4.jpg|thumb|Iran's northern Caspian Hyrcanian mixed forests are maintained by moisture captured from the Caspian Sea by the Alborz Mountain Range.]]



The rising level of the Caspian Sea between 1994 and 1996 reduced the number of habitats for rare species of aquatic vegetation. This has been attributed to a general lack of seeding material in newly formed coastal lagoons and water bodies.{{citation needed|date=April 2017}}


File:Benthophilus granulosus.jpg|thumb|Most tadpole gobies (Benthophilus) are only found in the Caspian Sea basin.]]The Caspian turtle (Mauremys caspica), although found in neighboring areas, is a wholly freshwater species. The zebra mussel is native to the Caspian and Black Sea basins, but has become an invasive species elsewhere, when introduced. The area has given its name to several species, including the Caspian gull and the Caspian tern. The Caspian seal (Pusa caspica) is the only aquatic mammal and is endemic to the Caspian Sea, being one of very few seal species that live in inland waters, but it is different from the those inhabiting freshwaters due to the hydrological environment of the sea. A century ago the Caspian was home to more than one million seals. Today, fewer than 10% remain.Archeological studies of Gobustan petroglyphs indicate that there once had been dolphinsJOURNAL, Фараджева, Малахат, 2015, Культурно-исторический контекст археологического комплекса Гобустан,weblink РОССИЙСКАЯ АРХЕОЛОГИЯ, â„– 4, 50–63,, 2019-02-20,weblink 2019-02-21, live, and porpoises,WEB, The Caspian Sea,weblink All The Sea, 2015-01-16,weblink" title="">weblink 2015-01-04, live, WEB, Masuleh,weblink 2015-01-16,weblink" title="">weblink 2015-01-19, dead, or a certain species of beaked whalesWEB,weblink Gallagher R., 2012, Azerbaijan: Land of Fire and Flood – Ancient Mariners and a Deluged Landscape – Rock Art Evidence of a Marine Inflow., The Official Graham Hancock Homepage, 2015-11-18,weblink 2015-11-18, live, and a whaling scene indicates large baleen whalesWEB,weblink Gallagher, R., The Ice Age Rise and Fall of the Ponto Caspian: Ancient Mariners and the Asiatic Mediterranean,, 2017-01-23,weblink" title="">weblink 2017-02-02, dead, likely being present in Caspian Sea at least until when the Caspian Sea ceased being a part of the ocean system or until the Quaternary or much more recent periods such as until the last glacial period or antiquity.WEB, The Smithsonian Institution, Gobustan Petroglyphs – Methods & Chronology,weblink 2015-01-19, dead,weblink" title="">weblink 2015-04-28, Although the rock art on Kichikdash Mountain is assumed to be of a dolphinWEB, The Smithsonian Institution, Gobustan Petroglyphs – Subject Matter,weblink 2015-01-19, dead,weblink" title="">weblink 2015-04-28, or of a beaked whale, it might instead represent the famous beluga sturgeon due to its size (430 cm in length), but fossil records suggest certain ancestors of modern dolphins and whales, such as Macrokentriodon morani (bottlenose dolphins) and Balaenoptera sibbaldina (blue whales) were presumably larger than their present descendants. From the same artworks, auks, like Brunnich's Guillemot could also have been in the sea as well, and these petroglyphs suggest marine inflow between the current Caspian Sea and the Arctic Ocean or North Sea, or the Black Sea. This is supported by the existences of current endemic, oceanic species such as lagoon cockles which was genetically identified to originate in Caspian/Black Seas regions.The sea's basin (including associated waters such as rivers) has 160 native species and subspecies of fish in more than 60 genera.Naseka, A.M. and Bogutskaya, N.G. (2009). "Fishes of the Caspian Sea: zoogeography and updated check-list". Zoosystematica Rossica 18(2): 295–317. About 62% of the species and subspecies are endemic, as are 4–6 genera (depending on taxonomic treatment). The lake proper has 115 natives, including 73 endemics (63.5%). Among the more than 50 genera in the lake proper, 3–4 are endemic: Anatirostrum, Caspiomyzon, Chasar (often included in Ponticola) and Hyrcanogobius. By far the most numerous families in the lake proper are gobies (35 species and subspecies), cyprinids (32) and clupeids (22). Two particularly rich genera are Alosa with 18 endemic species/subspecies and Benthophilus with 16 endemic species. Other examples of endemics are four species of Clupeonella, Gobio volgensis, two Rutilus, three Sabanejewia, Stenodus leucichthys, two Salmo, two Mesogobius and three Neogobius. Most non-endemic natives are either shared with the Black Sea basin or widespread Palearctic species such as crucian carp, Prussian carp, common carp, common bream, common bleak, asp, white bream, sunbleak, common dace, common roach, common rudd, European chub, sichel, tench, European weatherfish, wels catfish, northern pike, burbot, European perch and zander. Almost 30 non-indigenous, introduced fish species have been reported from the Caspian Sea, but only a few have become established.Six sturgeon species, the Russian, bastard, Persian, sterlet, starry and beluga, are native to the Caspian Sea. The last of these is arguably the largest freshwater fish in the world. The sturgeon yield roe (eggs) that are processed into caviar. Overfishing has depleted a number of the historic fisheries.C. Michael Hogan. "Overfishing". Encyclopedia of Earth. eds. Sidney Draggan and Cutler Cleveland. National Council for Science and the Environment, Washington DC In recent years, overfishing has threatened the sturgeon population to the point that environmentalists advocate banning sturgeon fishing completely until the population recovers. The high price of sturgeon caviar—more than 1,500 Azerbaijani manats (US$880 {{asof|2019|04|lc=y}}) per kilo—allows fishermen to afford bribes to ensure the authorities look the other way, making regulations in many locations ineffective.WEB,weblink Fishing Prospects, 2012-05-20, dead,weblink" title="">weblink 2008-09-05, Iran Daily, 2007-01-14, Caviar harvesting further endangers the fish stocks, since it targets reproductive females.



Many rare and endemic plant species of Russia are associated with the tidal areas of the Volga delta and riparian forests of the Samur River delta. The shoreline is also a unique refuge for plants adapted to the loose sands of the Central Asian Deserts. The principal limiting factors to successful establishment of plant species are hydrological imbalances within the surrounding deltas, water pollution, and various land reclamation activities. The water level change within the Caspian Sea is an indirect reason for which plants may not get established.These affect aquatic plants of the Volga Delta, such as Aldrovanda vesiculosa and the native Nelumbo caspica. About 11 plant species are found in the Samur River Delta, including the unique liana forests that date back to the Tertiary period.{{citation needed|date=April 2017}}


File:Extantigerturanianwksciam97.jpg|thumb|Illustration of two Caspian tigerCaspian tigerReptiles native to the region include spur-thighed tortoise (Testudo graeca buxtoni) and Horsfield's tortoise.
  • The Asiatic cheetah used to occur in the Trans-Caucasus and Central Asia, but is today restricted to Iran.BOOK, Heptner, V.G., Sludskij, A.A., 1972, 1992, Mlekopitajuščie Sovetskogo Soiuza. Moskva: VysÅ¡aia Å kola, Mammals of the Soviet Union. Volume II, Part 2. Carnivora (Hyaenas and Cats), Smithsonian Institution and the National Science Foundation, Washington DC,weblink 1–732, 2017-04-10,weblink 2017-10-20, live, Humphreys, P., Kahrom, E. (1999). Lion and Gazelle: The Mammals and Birds of Iran {{Webarchive|url= |date=2016-04-30 }}. Images Publishing, Avon.
  • The Asiatic lion used to occur in the Trans-Caucasus, Iran, and possibly the southern part of Turkestan.
  • The Caspian tiger used to occur in northern Iran, the Caucasus and Central Asia.
  • The Persian leopard is found in Iran, the Caucasus and Central Asia.


File:Bowen,_Emanuel;_Orbeliani,_Sulxan-Saba._A_new_and_accurate_map_of_the_Caspian_Sea._1747._(A).jpg|alt=A map of the Caspian Sea in the mid 1700s|thumb|A New and Accurate Map of the Caspian Sea by the Soskam Sabbus & Emanuel BowenEmanuel Bowen(File:Caspian sea Ibn Hawqal.JPG|thumb|Caspian Sea (Bahr ul-Khazar). 10th century map by Ibn Hawqal)The history of the Caspian sea is divided into two parts: a Miocene stage, determined by tectonic events that correlate with the closing of the Tethys Sea, and a Pleistocene stage, that includes glaciation cycles and the creation of the present Volga River. During the first stage, the Tethys Sea had evolved into the Sarmatian Lake, that was created from the modern Black Sea and south Caspian, when the collision of the Arabian peninsula with Western Asia pushed up the Kopet Dag and Caucasus Mountains, setting definitive south and west boundaries to the Caspian basin. This orogeneic movement was continuous throughout the years, while Caspian was regularly disconnecting from the Black Sea. In the late Pontian, a mountain arch rose across the south basin and divided it in the Khachmaz and Lankaran Lakes (or early Balaxani). The period of restriction to the south basin was reversed during the Akchagyglian, when the lake expanded to more than three times its present area and established the first of a series of contacts with the Black Sea and with Lake Aral. A recession of the lake Akchagyl completed stage one.JOURNAL, Dumont, H. J., December 22, 2003, The Caspian Lake: History, biota, structure, and function, Limnology and Oceanography, 43, 1, 44–52, 10.4319/lo.1998.43.1.0044, 0024-3590, 1998LimOc..43...44D, File:surikov1906.jpg|thumb|The 17th-century Cossack rebel and pirate Stenka Razin, on a raid in the Caspian (Vasily SurikovVasily SurikovThe earliest hominid remains found around the Caspian Sea are from Dmanisi dating back to around 1.8 Ma and yielded a number of skeletal remains of Homo erectus or Homo ergaster. More later evidence for human occupation of the region came from a number of caves in Georgia and Azerbaijan such as Kudaro and Azykh Caves. There is evidence for Lower Palaeolithic human occupation south of the Caspian from western Alburz. These are Ganj Par and Darband Cave sites.Neanderthal remains also have been discovered at a cave site in Georgia. Discoveries in the Huto cave and the adjacent Kamarband cave, near the town of Behshahr, Mazandaran south of the Caspian in Iran, suggest human habitation of the area as early as 11,000 years ago."Major Monuments" {{webarchive |url= |date=May 14, 2011 }}. Retrieved 2012-05-20.WEB,weblink Safeguarding Caspian Interests, 2016-02-07, dead,weblink" title="">weblink 2009-06-03, . (2006-11-26)The Caspian area is rich in energy resources. Oil wells were being dug in the region as early as the 10th century to reach oil "for use in everyday life, both for medicinal purposes and for heating and lighting in homes"."The Development of the Oil and Gas Industry in Azerbaijan {{Webarchive|url= |date=2007-09-29 }}". SOCAR{{full citation needed|date=July 2018}} By the 16th century, Europeans were aware of the rich oil and gas deposits around the area. English traders Thomas Bannister and Jeffrey Duckett described the area around Baku as "a strange thing to behold, for there issueth out of the ground a marvelous quantity of oil, which serveth all the country to burn in their houses. This oil is black and is called nefte. There is also by the town of Baku, another kind of oil which is white and very precious [i.e., petroleum].""Back to the Future: Britain, Baku Oil and the Cycle of History {{Webarchive|url= |date=2007-09-29 }}". SOCAR{{full citation needed|date=July 2018}}Greeks also called it Hyrcanian/Hyrkanian Sea ( and Υρκανία θάλασσαWEB,weblink Cosmas Indicopleustes, Christian Topography, §132, 2019-03-30,weblink" title="">weblink 2017-04-22, live, }}).In the 18th century, during the rule of Peter I the Great, Fedor I. Soimonov, hydrographer and pioneering explorer of the Caspian Sea charted the until then little known body of water. Soimonov drew a set of four maps and wrote Pilot of the Caspian Sea, the first report and modern maps of the Caspian, that were published in 1720 by the Russian Academy of Sciences.WEB,weblink Fedor I. Soimonov, Encyclopædia Britannica, 9 October 2015,weblink" title="">weblink 29 November 2014, live, Today, oil and gas platforms abound along the edges of the sea.WEB, Caspian Sea Map, Caspian Sea Location Facts History, Major Bodies of Water, World Atlas, September 29, 2015,weblink December 19, 2017,weblink December 22, 2017, live,


File:View of night Baku, 2010.jpg|thumb|Baku, the capital of AzerbaijanAzerbaijan



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(File:Oil pipelines in the Caspian region.gif|thumb|Oil pipelines in the Caspian region. September 2002)Countries on the Caspian region, such as Azerbaijan, Kazakhstan and Turkmenistan, illustrate the examples of natural-resource-based economies. A resource-based economy is defined as one where the natural resources, oil and gas, compose more than 10 percent of the particular country's GDP and 40 percent of exports.BOOK,weblink Economics of the Caspian Oil and Gas Wealth: Companies, Governments, Policies, Kalyuzhnova, Y., 2008, Springer, 978-0-230-22755-2, en, All the Caspian region economies are highly dependent on the mineral wealth. The world energy markets were influenced by Azerbaijan and Kazakhstan, as they became strategically crucial in this sphere, thus attracting the largest share of FDI (foreign direct investment).Iran has an enormous energy potential based on several specific factors. It has reserves containing 137.5 billion bbl of crude oil, the second largest in the world, producing around four million bbl/day. Additionally, Iran has an estimated 988.4 trillion cubic feet of natural gas, around 16 percent of total world reserves, which makes it to play a key role in the global energy security equation.BOOK,weblink Economics of the Caspian Oil and Gas Wealth: Companies, Governments, Policies, Kalyuzhnova, Y., 2008, Springer, 978-0-230-22755-2, en, Russia's economy ranks as the twelfth largest by nominal GDP and sixth largest by purchasing power parity in 2015.WEB,weblink Report for Selected Countries and Subjects,, 2018-12-05,weblink 2018-09-18, live, Russia's extensive mineral and energy resources are the largest such reserves in the world,WEB,weblink Commission of the Russian Federation for UNESCO,, 2018-12-05,weblink" title="">weblink 2011-03-23, live, making it the second leading producer of oil and natural gas globally.WEB,weblink The World Factbook — Central Intelligence Agency,, 2018-12-05,weblink 2016-03-15, live, Caspian littoral states join efforts to develop infrastructure, tourism and trade in the region. The first Caspian Economic Forum was convened on August 12, 2019 in Turkmenistan and brought together representatives of Kazakhstan, Russia, Azerbaijan, Iran and Turkmenistan. The forum included several meetings of Caspian littoral countries’ ministers of economy and transport ministers.WEB, The Astana Times,weblink, 2019-08-13,

Oil and gas

File:Jack-up-rig-in-the-caspian-sea.JPG|alt=Oil production using drilling platform, on the offshore of Turkmenistan|thumb|Drilling platform "Iran Khazar" in use at a Dragon Oil production platform in the Cheleken field (TurkmenistanTurkmenistanThe Caspian Sea region presently is a significant, but not major, supplier of crude oil to world markets, based upon estimates by BP Amoco and the U.S. Energy Information Administration, U.S. Department of Energy. The Caspian region produced an estimated 1.4–1.5 million barrels per day (bbls/day) including natural gas liquids in 2001, or 1.9% of total world output (table 1).3 More than a dozen non-Caspian countries each produce more than 1.5 million bbls/day. Caspian region production has been higher, but suffered during the collapse of the Soviet Union and the years following. Kazakhstan accounts for 55% and Azerbaijan for about 20% of current regional oil output.WEB,weblink Caspian Oil and Gas: Production and Prospects, Geld, Bernard, April 9, 2002,, 2018-12-05,weblink" title="">weblink December 6, 2018, dead, (File:Caspian region oil and natural gas infrastructure.png|thumb|Caspian region oil and natural gas infrastructure. August 2013.)The world's first offshore wells and machine-drilled wells were made in Bibi-Heybat Bay, near Baku, Azerbaijan. In 1873, exploration and development of oil began in some of the largest fields known to exist in the world at that time on the Absheron Peninsula near the villages of Balakhanli, Sabunchi, Ramana, and Bibi Heybat. Total recoverable reserves were more than 500 million tons. By 1900, Baku had more than 3,000 oil wells, 2,000 of which were producing at industrial levels. By the end of the 19th century, Baku became known as the "black gold capital", and many skilled workers and specialists flocked to the city.By the beginning of the 20th century, Baku was the centre of international oil industry. In 1920, when the Bolsheviks captured Azerbaijan, all private property – including oil wells and factories – was confiscated. Afterwards, the republic's entire oil industry came under the control of the Soviet Union. By 1941, Azerbaijan was producing a record 23.5 million tons of oil per year, and the Baku region supplied nearly 72 percent of all oil extracted in the entire Soviet Union.In 1994, the "Contract of the Century" was signed, signalling the start of major international development of the Baku oil fields. The Baku–Tbilisi–Ceyhan pipeline, a major pipeline allowing Azerbaijan oil to flow straight to the Turkish Mediterranean port of Ceyhan, opened in 2006.The Vladimir Filanovsky field in the Russian section of the body of water was discovered for its wealth of oil in 2005. It is reportedly the largest discovery of oil in 25 years. It was announced in October 2016 that Lukoil would start production in this region.WEB, LUKOIL starts up V. Filanovsky in the Caspian Sea,weblink October 31, 2016, November 2, 2016,weblink" title="">weblink November 3, 2016, live,


Baku, which is the starting point of all sea routes of Azerbaijan, is the largest port of the Caspian Sea. Azerbaijan has access to the oceans along the Caspian Sea-Volga-Volga-Don Canal, and the Don-Sea of Azov. Along with the Volga-Don Canal, the Azerbaijani vessels have the opportunity to enter the world ocean through the Volga-Baltic and White Sea-Baltic canals. Moreover, oil tankers are being transported through the Caspian Sea. Baku Sea Trade Port and Caspian Shipping Company CJSC, have a big role in the sea transportation of Azerbaijan. The Caspian Sea Shipping Company CJSC, along with the transport fleet, also includes a specialized fleet and shipyards. The transport fleet consists of 51 vessels, including 20 tankers, 13 ferries, 15 universal dry cargo vessels, 2 Ro-Ro vessels, as well as 1 technical vessel and 1 floating workshop. The specialized fleet includes 210 vessels, including 20 cranes, 25 towing and supplying vehicles, 26 passenger, two pipe-laying, six fire-fighting, seven engineering-geological, two diving and 88 auxiliary vessels.WEB,weblink Volume of oil tanker transportation in Caspian Sea to increase, 2018-05-01,, en, 2018-12-05,weblink 2018-12-06, live, The Caspian Sea Shipping Company of Azerbaijan, which acts as a liaison in the Transport Corridor Europe-Caucasus-Asia (TRACECA), simultaneously with the transportation of cargo and passengers in the Trans-Caspian direction, also performs work to fully ensure the processes of oil and gas production at sea. This activity has a rich history. The development of the shipping industry in Azerbaijan is closely connected with the formation and progress of the oil industry. In the 19th century, the sharp increase in oil production in Baku gave a huge impetus to the development of shipping in the Caspian Sea, and as a result, there was a need to create fundamentally new floating facilities for the transportation of oil and oil products.WEB,weblink Caspian Sea-Black Sea Transport, Georgia Today on the Web, 2018-12-05,weblink" title="">weblink 2018-12-06, live,

Political issues

Many of the islands along the Azerbaijani coast continue to hold significant geopolitical and economic importance because of the potential oil reserves found nearby. Bulla Island, Pirallahı Island, and Nargin, which is still used as a former Soviet base and is the largest island in the Baku bay, all hold oil reserves.The collapse of the Soviet Union and subsequent opening of the region has led to an intense investment and development scramble by international oil companies. In 1998, Dick Cheney commented that "I can't think of a time when we've had a region emerge as suddenly to become as strategically significant as the Caspian.""The Great Gas Game {{Webarchive|url= |date=2007-06-08 }}", Christian Science Monitor (2001-10-25)A key problem to further development in the region is the status of the Caspian Sea and the establishment of the water boundaries among the five littoral states. The current disputes along Azerbaijan's maritime borders with Turkmenistan and Iran could potentially affect future development plans.Much controversy currently exists over the proposed Trans-Caspian oil and gas pipelines. These projects would allow Western markets easier access to Kazakh oil and, potentially, Uzbek and Turkmen gas as well. Russia officially opposes the project on environmental grounds.Sergei Blagov, "Russia Tries to Scuttle Proposed Trans-Caspian Pipeline {{Webarchive|url= |date=2007-06-10 }}", Eurasianet (2006-03-27) However, analysts note that the pipelines would bypass Russia completely, thereby denying the country valuable transit fees, as well as destroying its current monopoly on westward-bound hydrocarbon exports from the region. Recently, both Kazakhstan and Turkmenistan have expressed their support for the Trans-Caspian Pipeline."Russia Seeking To Keep Kazakhstan Happy {{Webarchive|url= |date=2008-05-12 }}", Eurasianet (2007-12-10)U.S. diplomatic cables disclosed by WikiLeaks revealed that BP covered up a gas leak and blowout incident in September 2008 at an operating gas field in the Azeri-Chirag-Guneshi area of the Azerbaijan Caspian Sea.NEWS, Tim Webb,weblink WikiLeaks cables: BP suffered blowout on Azerbaijan gas platform, The Guardian, 2010-12-15, 2013-03-26, London,weblink" title="">weblink 2010-12-16, live, NEWS, Walt, Vivienne,weblink WikiLeaks Reveals BP's 'Other' Offshore Drilling Disaster, Time, 2010-12-18, 2013-03-26,weblink" title="">weblink 2013-03-25, live,

Territorial status

(File:Iran southern caspian energy prospects 2004.jpg|thumb|Southern Caspian Energy Prospects (portion of Iran). Country Profile 2004.)(File:Baku Bulvar.jpg|right|thumb|Caspian Sea, Azerbaijan){{as of|2000}}, negotiations related to the demarcation of the Caspian Sea had been going on for nearly a decade among the states bordering the Caspian – Azerbaijan, Russia, Kazakhstan, Turkmenistan, and Iran. The status of the Caspian SeaWEB,weblink 8.3 The Status of the Caspian Sea – Dividing Natural Resources Between Five Countries, Khoshbakht B. Yusifzade,, 2010-05-17,weblink" title="">weblink 2010-02-02, live, is the key problem. Access to mineral resources (oil and natural gas), access for fishing, and access to international waters (through Russia's Volga river and the canals connecting it to the Black Sea and Baltic Sea) all depend upon the outcomes of negotiations. Access to the Volga River is particularly important for the landlocked states of Azerbaijan, Kazakhstan, and Turkmenistan. This concerns Russia, because the potential traffic would use its inland waterways. If a body of water is labelled as a sea, then there would be some precedents and international treaties obliging the granting of access permits to foreign vessels. If a body of water is labelled merely as a lake, then there are no such obligations. Environmental issues are also somewhat connected to the status and borders issue.All five Caspian littoral states maintain naval forces on the sea.{{citation|url=|title=The great Caspian arms race|periodical=Foreign Policy|date=June 2012|access-date=2017-03-06|archive-url=|archive-date=2014-10-09|url-status=live}}According to a treaty signed between Iran and the Soviet Union, the Caspian Sea is technically a lake and was divided into two sectors (Iranian and Soviet), but the resources (then mainly fish) were commonly shared. The line between the two sectors was considered an international border in a common lake, like Lake Albert. The Soviet sector was sub-divided into the four littoral republics' administrative sectors.Russia, Kazakhstan, and Azerbaijan have bilateral agreements with each other based on median lines. Because of their use by the three nations, median lines seem to be the most likely method of delineating territory in future agreements. However, Iran insists on a single, multilateral agreement between the five nations (as this is the only way for it to achieve a one-fifth share of the sea). Azerbaijan is at odds with Iran over some oil fields that both states claim. Occasionally, Iranian patrol boats have fired at vessels sent by Azerbaijan for exploration into the disputed region. There are similar tensions between Azerbaijan and Turkmenistan (the latter claims that the former has pumped more oil than agreed from a field, recognized by both parties as shared).The Caspian littoral states' meeting in 2007 signed an agreement that bars any ship not flying the national flag of a littoral state from entering the sea.WEB,weblink Russia Gets Way in Caspian Meet, 2007-10-28, bot: unknown,weblink" title="">weblink 2008-01-20, {{failed verification|date=September 2015}}Negotiations among the five littoral states have been ongoing, amidst ebbs and flows, for the past 20 years, with some degree of progress being made at the fourth Caspian Summit held in Astrakhan in 2014.{{citation|author=Nicola Contessi|title=Traditional Security in Eurasia: The Caspian caught between Militarisation and Diplomacy|volume = 160|issue=2|pages=50–57|periodical=The RUSI Journal|date=April 2015|doi=10.1080/03071847.2015.1031525}}

Caspian Summit

The Caspian Summit is a head of state-level meeting of the five littoral states.NEWS, Five Leaders Attend Caspian Summit,weblink RadioFreeEurope RadioLiberty, 2018-08-13,weblink 2018-08-13, live, The fifth Caspian Summit took place on August 12, 2018 in the Kazakh port city of Aktau. The five leaders signed the ‘Convention on the Legal Status of the Caspian Sea’.NEWS, Five states sign convention on legal status of Caspian Sea,weblink SOTT, 2018-08-13,weblink 2018-08-13, live, Representatives of the Caspian littoral states held a meeting in the capital of Kazakhstan on September 28, 2018 as a follow-up to the Aktau Summit. The conference was hosted by the Kazakh Ministry of Investment and Development. The participants in the meeting agreed to host an investment forum for the Caspian region every two years.WEB, Caspian Sea states to host sea-related investment forum every two years,weblink, 2019-04-25,weblink 2019-04-25, live, 2018-10-03,

Convention on the legal status of the Caspian Sea

The five littoral states build consensus on legally binding governance of the Caspian Sea through Special Working Groups of a Convention on the Legal Status of the Caspian Sea.WEB, Are the Littoral States Close to Signing an Agreement on the Legal Status of the Caspian Sea?,weblink The Jamestown Foundation, 2018-07-13,weblink 2018-07-13, live, In advance of a Caspian Summit, 51st Special Working Group took place in Astana in May 2018 and found consensus on multiple agreements: Agreements on cooperation in the field of transport; trade and economic cooperation; prevention of incidents on the sea; combating terrorism; fighting against organized crime; and border security cooperation.WEB, The working group agreed on the provisional agenda of the Caspian summit and the draft of final document,weblink, 2018-07-13,weblink" title="">weblink 2018-07-13, live, The convention grants jurisdiction over 15 miles of territorial waters to each neighboring country, plus additional 10 miles of exclusive fishing rights on the surface, while the rest is international waters. The seabed, on the other hand, remains undefined, subject to bilateral agreements between countries. Thus, the Caspian Sea is legally neither fully a sea nor a lake.NEWS,weblink Is the Caspian a sea or a lake?, 2018-08-16, The Economist, 2018-08-20,weblink 2018-08-19, live, While the convention addresses caviar production, oil and gas extraction, and military uses, it does not touch on environmental issues.

Crossborder inflow

UNECE recognizes several rivers that cross international borders which flow into the Caspian Sea.WEB,weblink Drainage basing of the Caspian Sea,, 2012-03-12,weblink" title="">weblink 2009-07-31, live, These are:{|class="wikitable"! River! Countries|Atrek River|Iran, TurkmenistanKura (Caspian Sea)>Kura River|Armenia, Azerbaijan, Georgia, Iran, Turkey|Ural River|Kazakhstan, Russia|Samur River|Azerbaijan, Russia|Sulak River|Georgia, Russia|Terek River|Georgia, Russia


Although the Caspian Sea is endorheic, its main tributary, the Volga, is connected by important shipping canals with the Don River (and thus the Black Sea) and with the Baltic Sea, with branch canals to Northern Dvina and to the White Sea.Another Caspian tributary, the Kuma River, is connected by an irrigation canal with the Don basin as well.Several scheduled ferry services (including train ferries) operate on the Caspian Sea, including: The ferries are mostly used for cargo; only the Baku–Aktau and Baku–Türkmenbaşy routes accept passengers.


As an endorheic basin, the Caspian Sea basin has no natural connection with the ocean. Since the medieval period, traders reached the Caspian via a number of portages that connected the Volga and its tributaries with the Don River (which flows into the Sea of Azov) and various rivers that flow into the Baltic Sea. Primitive canals connecting the Volga Basin with the Baltic have been constructed as early as the early 18th century. Since then, a number of canal projects have been completed.The two modern canal systems that connect the Volga Basin, and hence the Caspian Sea, with the ocean are the Volga–Baltic Waterway and the Volga–Don Canal.The proposed Pechora–Kama Canal was a project that was widely discussed between the 1930s and 1980s. Shipping was a secondary consideration. Its main goal was to redirect some of the water of the Pechora River (which flows into the Arctic Ocean) via the Kama River into the Volga. The goals were both irrigation and the stabilization of the water level in the Caspian, which was thought to be falling dangerously fast at the time. During 1971, some peaceful nuclear construction experiments were carried out in the region by the U.S.S.R.In June 2007, in order to boost his oil-rich country's access to markets, Kazakhstan's President Nursultan Nazarbayev proposed a {{convert|700|km|0|abbr=off|adj=on}} link between the Caspian Sea and the Black Sea. It is hoped that the "Eurasia Canal" (Manych Ship Canal) would transform landlocked Kazakhstan and other Central Asian countries into maritime states, enabling them to significantly increase trade volume. Although the canal would traverse Russian territory, it would benefit Kazakhstan through its Caspian Sea ports. The most likely route for the canal, the officials at the Committee on Water Resources at Kazakhstan's Agriculture Ministry say, would follow the Kuma–Manych Depression, where currently a chain of rivers and lakes is already connected by an irrigation canal (Kuma–Manych Canal). Upgrading the Volga–Don Canal would be another option.Caspian Canal Could Boost Kazakh Trade {{Webarchive|url= |date=2009-01-19 }} Business Week (2007-07-09)

See also

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External links

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