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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:

Co-ordinates	Country, territory or sea	Notes
90°0′N 90°0′W / 90.000°N 90.000°W / 90.000; -90.000 (Arctic Ocean)	Arctic Ocean
81°54′N 90°0′W / 81.900°N 90.000°W / 81.900; -90.000 (Canada)	Canada	Nunavut — Ellesmere Island
81°1′N 90°0′W / 81.017°N 90.000°W / 81.017; -90.000 (Nansen Sound)	Nansen Sound
80°31′N 90°0′W / 80.517°N 90.000°W / 80.517; -90.000 (Canada)	Canada	Nunavut — Axel Heiberg Island
78°17′N 90°0′W / 78.283°N 90.000°W / 78.283; -90.000 (Norwegian Bay)	Norwegian Bay
77°22′N 90°0′W / 77.367°N 90.000°W / 77.367; -90.000 (Canada)	Canada	Nunavut — Graham Island
77°13′N 90°0′W / 77.217°N 90.000°W / 77.217; -90.000 (Norwegian Bay)	Norwegian Bay
76°50′N 90°0′W / 76.833°N 90.000°W / 76.833; -90.000 (Canada)	Canada	Nunavut — North Kent Island and Devon Island
74°34′N 90°0′W / 74.567°N 90.000°W / 74.567; -90.000 (Barrow Strait)	Barrow Strait
74°4′N 90°0′W / 74.067°N 90.000°W / 74.067; -90.000 (Canada)	Canada	Nunavut — Prince Leopold Island
73°59′N 90°0′W / 73.983°N 90.000°W / 73.983; -90.000 (Prince Regent Inlet)	Prince Regent Inlet
72°4′N 90°0′W / 72.067°N 90.000°W / 72.067; -90.000 (Canada)	Canada	Nunavut — Baffin Island
71°31′N 90°0′W / 71.517°N 90.000°W / 71.517; -90.000 (Gulf of Boothia)	Gulf of Boothia
69°7′N 90°0′W / 69.117°N 90.000°W / 69.117; -90.000 (Canada)	Canada	Nunavut — several islands including Helen Island, and the mainland
63°46′N 90°0′W / 63.767°N 90.000°W / 63.767; -90.000 (Hudson Bay)	Hudson Bay
57°1′N 90°0′W / 57.017°N 90.000°W / 57.017; -90.000 (Canada)	Canada	Manitoba Ontario — from 56°13′N 90°0′W / 56.217°N 90.000°W / 56.217; -90.000 (Ontario)
48°3′N 90°0′W / 48.050°N 90.000°W / 48.050; -90.000 (United States)	United States	Minnesota
47°49′N 90°0′W / 47.817°N 90.000°W / 47.817; -90.000 (Lake Superior)	Lake Superior
46°41′N 90°0′W / 46.683°N 90.000°W / 46.683; -90.000 (United States)	United States	Michigan Wisconsin — from 46°19′N 90°0′W / 46.317°N 90.000°W / 46.317; -90.000 (Wisconsin), passing through Reedsburg (at 43°32′N 90°0′W / 43.533°N 90.000°W / 43.533; -90.000); crosses the 45th parallel north in Marathon County, Wisconsin, having one of the 45 x 90 points (at 45°00′N 90°00′W / 45.000°N 90.000°W / 45.000; -90.000) Illinois — from 42°30′N 90°0′W / 42.500°N 90.000°W / 42.500; -90.000 (Illinois) Missouri — from 37°58′N 90°0′W / 37.967°N 90.000°W / 37.967; -90.000 (Missouri), passing a mile and a half (2 km) east of Ste. Genevieve Arkansas — from 36°0′N 90°0′W / 36.000°N 90.000°W / 36.000; -90.000 (Arkansas) Tennessee — from 35°33′N 90°0′W / 35.550°N 90.000°W / 35.550; -90.000 (Tennessee), passing through Memphis (at 35°8′N 90°0′W / 35.133°N 90.000°W / 35.133; -90.000 (Memphis)) Mississippi — from 35°0′N 90°0′W / 35.000°N 90.000°W / 35.000; -90.000 (Mississippi), passing through Brandon (at 32°17′N 90°0′W / 32.283°N 90.000°W / 32.283; -90.000 (Brandon)) a suburb of Jackson Louisiana — from 31°0′N 90°0′W / 31.000°N 90.000°W / 31.000; -90.000 (Louisiana), passing through New Orleans (at 30°2.5′N 90°0′W / 30.0417°N 90.000°W / 30.0417; -90.000 (New Orleans))
29°13′N 90°0′W / 29.217°N 90.000°W / 29.217; -90.000 (Gulf of Mexico)	Gulf of Mexico
21°10′N 90°0′W / 21.167°N 90.000°W / 21.167; -90.000 (Mexico)	Mexico	Yucatán Campeche — from 20°28′N 90°0′W / 20.467°N 90.000°W / 20.467; -90.000 (Campeche)
17°49′N 90°0′W / 17.817°N 90.000°W / 17.817; -90.000 (Guatemala)	Guatemala	Passing through Jalapa
13°57′N 90°0′W / 13.950°N 90.000°W / 13.950; -90.000 (El Salvador)	El Salvador	Ahuachapán — Passing through of Western Tacuba district (at 13°54′N 90°0′W / 13.900°N 90.000°W / 13.900; -90.000 (Tacuba)), Central San Francisco Menéndez district (at 13°50′N 90°00′W / 13.833°N 90.000°W / 13.833; -90.000 (San Francisco Menéndez)), and finishing the Barra de Santiago canton (at 13°41′N 90°0′W / 13.683°N 90.000°W / 13.683; -90.000 (Barra de Santiago)).
13°41′N 90°0′W / 13.683°N 90.000°W / 13.683; -90.000 (Pacific Ocean)	Pacific Ocean	Passing just west of Genovesa Island, Galápagos,  Ecuador (at 0°19′N 89°58′W / 0.317°N 89.967°W / 0.317; -89.967 (Genovesa Island)) Passing just east of Santa Fe Island, Galápagos,  Ecuador (at 0°49′S 90°2′W / 0.817°S 90.033°W / -0.817; -90.033 (Santa Fe Island))
60°0′S 90°0′W / 60.000°S 90.000°W / -60.000; -90.000 (Southern Ocean)	Southern Ocean
72°28′S 90°0′W / 72.467°S 90.000°W / -72.467; -90.000 (Antarctica)	Antarctica	Border between unclaimed territory (to the west) and Antártica Chilena Province (to the east), claimed by  Chile

See also

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

v t e Circles of latitude / meridians

Equator Tropic of Cancer Tropic of Capricorn Arctic Circle Antarctic Circle Equator Tropic of Cancer Tropic of Capricorn Arctic Circle Antarctic Circle Equator Tropic of Cancer Tropic of Capricorn Arctic Circle Antarctic Circle W0°E 30° 60° 90° 120° 150° 180° 30° 60° 90° 120° 150° 180° 5° 15° 25° 35° 45° 55° 65° 75° 85° 95° 105° 115° 125° 135° 145° 155° 165° 175° 5° 15° 25° 35° 45° 55° 65° 75° 85° 95° 105° 115° 125° 135° 145° 155° 165° 175° 10° 20° 40° 50° 70° 80° 100° 110° 130° 140° 160° 170° 10° 20° 40° 50° 70° 80° 100° 110° 130° 140° 160° 170° 0° 10° 20° 30° 40° 50° 60° 70° 80° 90° 10° 20° 30° 40° 50° 60° 70° 80° 90° 5° N 15° 25° 35° 45° 55° 65° 75° 85° 5° S 15° 25° 35° 45° 55° 65° 75° 85° 45x90 45x90 45x90 45x90

References

• Meridians (geography)
• Borders of Chile