Line of longitude
Themeridian 90° west ofGreenwich is a line oflongitude [ 1] North Pole across theArctic Ocean ,North America , theGulf of Mexico ,Central America , thePacific Ocean , theSouthern Ocean , andAntarctica to theSouth Pole .
In Antarctica, the meridian defines the western limit ofChile 'sterritorial claim . The land further west is not claimed by any nation. The meridian also defines the western limit of the Lima, Antofagasta, Santiago, Puerto Montt and Punta Arenasflight information regions .
The 90th meridian west forms agreat ellipse with the90th meridian east , located midway between the Prime meridian and the180th meridian ; thus, the center of theWestern Hemisphere is on this meridian.
In the United States, theMississippi River runs close to the 90th meridian, crossing the meridian several times. The cities ofSt. Louis ,Memphis andNew Orleans are all close to the meridian.
One of the four45×90 points is located inRietbrock, Wisconsin , where the45th parallel north intersects with the 90th meridian west, marking the halfway point between the90° Latitude North ,180th Meridian East & West ,0° latitude , and0° longitude .
Starting at theNorth Pole and heading south to theSouth 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 andDevon 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 includingHelen Island , and the mainland63°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 — from56°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 — from46°19′N 90°0′W / 46.317°N 90.000°W /46.317; -90.000 (Wisconsin ) Reedsburg (at43°32′N 90°0′W / 43.533°N 90.000°W /43.533; -90.000 45th parallel north inMarathon County, Wisconsin , having one of the45 x 90 points (at45°00′N 90°00′W / 45.000°N 90.000°W /45.000; -90.000 Illinois — from42°30′N 90°0′W / 42.500°N 90.000°W /42.500; -90.000 (Illinois ) Missouri — from37°58′N 90°0′W / 37.967°N 90.000°W /37.967; -90.000 (Missouri ) Ste. Genevieve Arkansas — from36°0′N 90°0′W / 36.000°N 90.000°W /36.000; -90.000 (Arkansas ) Tennessee — from35°33′N 90°0′W / 35.550°N 90.000°W /35.550; -90.000 (Tennessee ) Memphis (at35°8′N 90°0′W / 35.133°N 90.000°W /35.133; -90.000 (Memphis ) Mississippi — from35°0′N 90°0′W / 35.000°N 90.000°W /35.000; -90.000 (Mississippi ) Brandon (at32°17′N 90°0′W / 32.283°N 90.000°W /32.283; -90.000 (Brandon ) Jackson Louisiana — from31°0′N 90°0′W / 31.000°N 90.000°W /31.000; -90.000 (Louisiana ) New Orleans (at30°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 — from20°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 throughJalapa 13°57′N 90°0′W / 13.950°N 90.000°W /13.950; -90.000 (El Salvador ) El Salvador Ahuachapán — Passing through of WesternTacuba district (at13°54′N 90°0′W / 13.900°N 90.000°W /13.900; -90.000 (Tacuba ) San Francisco Menéndez district (at13°50′N 90°00′W / 13.833°N 90.000°W /13.833; -90.000 (San Francisco Menéndez ) Barra de Santiago canton (at13°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 ofGenovesa Island ,Galápagos ,Ecuador (at0°19′N 89°58′W / 0.317°N 89.967°W /0.317; -89.967 (Genovesa Island ) Santa Fe Island ,Galápagos ,Ecuador (at0°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 betweenunclaimed territory (to the west) andAntártica Chilena Province (to the east), claimed byChile
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