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{{Short description|Line of longitude}}{{Unreferenced|date=January 2021}}{{Location map-line|lon=-90}}{{kml}}The meridian 90° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Gulf of Mexico, Central America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole.In Antarctica, the meridian defines the western limit of Chile's territorial claim. The land further west is not claimed by any nation.The 90th meridian west forms a great circle with the 90th meridian east, located midway between the Prime meridian and the 180th meridian; thus, the center of the Western Hemisphere is on this meridian.In the United States, the Mississippi River runs close to the 90th meridian, crossing the meridian several times. The cities of St. Louis, Memphis and New Orleans are all close to the meridian.One of the four 45 x 90 points is located in Rietbrock, Wisconsin, where the 45th parallel north intersects with the 90th meridian west, marking the halfway point between the 90° Latitude North, 180th Meridian East & West, 0° latitude, and 0° longitude.

From Pole to Pole

Starting at the North Pole and heading south to the South Pole, the 90th meridian west passes through: ! scope="col" width="120" | Co-ordinates! scope="col" | Country, territory or sea! scope="col" | Notes

{{Coord	0	90	W	name=Arctic Ocean}}! scope="row" style="background:#b0e0e6;" | Arctic Ocean

81	N	0	type:country|name=Canada}}! scope="row" | {{CAN}}| Nunavut — Ellesmere Island

{{Coord	1	90	W	name=Nansen Sound}}! scope="row" style="background:#b0e0e6;" | Nansen Sound

80	N	0	type:country|name=Canada}}! scope="row" | {{CAN}}| Nunavut — Axel Heiberg Island

{{Coord	17	90	W	name=Norwegian Bay}}! scope="row" style="background:#b0e0e6;" | Norwegian Bay

77	N	0	type:country|name=Canada}}! scope="row" | {{CAN}}	Nunavut — Graham Island (Nunavut)>Graham Island

{{Coord	13	90	W	name=Norwegian Bay}}! scope="row" style="background:#b0e0e6;" | Norwegian Bay

76	N	0	type:country|name=Canada}}! scope="row" | {{CAN}}| Nunavut — North Kent Island and Devon Island

{{Coord	34	90	W	name=Barrow Strait}}! scope="row" style="background:#b0e0e6;" | Barrow Strait

74	N	0	type:country|name=Canada}}! scope="row" | {{CAN}}	Nunavut — Port Leopold, Prince Leopold Island and Elwin Bay>Prince Leopold Island

{{Coord	59	90	W	name=Prince Regent Inlet}}! scope="row" style="background:#b0e0e6;" | Prince Regent Inlet

72	N	0	type:country|name=Canada}}! scope="row" | {{CAN}}| Nunavut — Baffin Island

{{Coord	31	90	W	name=Gulf of Boothia}}! scope="row" style="background:#b0e0e6;" | Gulf of Boothia

69	N	0	type:country|name=Canada}}! scope="row" | {{CAN}}| Nunavut — several islands including Helen Island, and the mainland

{{Coord	46	90	W	name=Hudson Bay}}! scope="row" style="background:#b0e0e6;" | Hudson Bay

valign="top"

57	N	0	type:country|name=Canada}}! scope="row" | {{CAN}}	Manitoba Ontario — from {{Coord>56	N	0	type:adm1st|name=Ontario}}

48	N	0	type:country|name=United States}}! scope="row" | {{USA}}| Minnesota

{{Coord	49	90	W	name=Lake Superior}}! scope="row" style="background:#b0e0e6;" | Lake Superior

valign="top"

46

N

0

type:country|name=United States}}! scope="row" | {{USA}}

Michigan Wisconsin — from {{Coord>46

N

0

type:adm1st

Reedsburg, Wisconsin>Reedsburg (at {{Coord

32

90

W

45th parallel north in Marathon County, Wisconsin, having one of the 45×90 points>45 x 90 points (at {{Coord

00

90

W

Illinois — from {{Coord>42

N

0

type:adm1st

Missouri — from {{Coord>37

N

0

type:adm1st

Ste. Genevieve, Missouri>Ste. Genevieve Arkansas — from {{Coord

0

90

W

name=Arkansas}} Tennessee — from {{Coord

33

90

W

name=Tennessee}}, passing through Memphis, Tennessee

(at {{Coord>35

N

0

type:city

Mississippi — from {{Coord>35

N

0

type:adm1st

Brandon, Mississippi>Brandon (at {{Coord

17

90

W

name=Brandon}}) a suburb of Jackson,_Mississippi

Louisiana — from {{Coord>31

N

0

type:adm1st

New Orleans (at {{Coord>30

N

0

type:city|name=New Orleans}})

{{Coord	13	90	W	name=Gulf of Mexico}}! scope="row" style="background:#b0e0e6;" | Gulf of Mexico

valign="top"

21	N	0	type:country|name=Mexico}}! scope="row" | {{MEX}}	Yucatán (state)>Yucatán Campeche — from {{Coord	28	90	W	name=Campeche}}

17	N	0	type:country|name=Guatemala}}! scope="row" | {{GTM}}	Jalapa, Jalapa>Jalapa

13	N	0	type:country|name=El Salvador}}! scope="row" | {{SLV}}|

valign="top"

{{Coord

41

90

W

name=Pacific Ocean}}! scope="row" style="background:#b0e0e6;" | Pacific Ocean

Passing just west of Genovesa Island, Galápagos Islands

, {{ECU}} (at {{Coord>0

N

58

type:isle

Santa Fe Island, Galápagos Islands>Galápagos, {{ECU}} (at {{Coord

49

90

W

name=Santa Fe Island}})

{{Coord	0	90	W	name=Southern Ocean}}! scope="row" style="background:#b0e0e6;" | Southern Ocean

valign="top"

72	S	0	type:country|name=Antarctica}}! scope="row" | Antarctica	List of Antarctic territorial claims>unclaimed territory (to the west) and Antártica Chilena Province (to the east), claimed by {{CHL}}

{{Long-seq|2}}

See also

• 89th meridian west
• 91st meridian west
• 45×90 points

{{-}}{{geographical coordinates|state=collapsed}}

References

{{Reflist}}