# 110th meridian west

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The meridian 110° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole.
The 110th meridian west forms a great circle with the 70th meridian east.
In Canada, the meridian forms the boundary between Nunavut and the Northwest Territories north of the parallel 70° north. Originally 110°W was intended as the Fourth Meridian for the Dominion Land Survey, but because of the imperfect surveying methods of the time, the meridian was placed a few hundred metres west of this longitude. The Fourth Meridian has been the entire boundary between Alberta and Saskatchewan since 1905.
In the United States, the meridian formed the western border of the historic and extralegal Territory of Jefferson.

## From pole to pole

Starting at the North Pole and heading south to the South Pole, the 110th meridian west passes through:
    Co-ordinates Country, territory or sea Notes 90°0′N 110°0′W﻿ / ﻿90.000°N 110.000°W﻿ / 90.000; -110.000﻿ (Arctic Ocean) Arctic Ocean 78°41′N 110°0′W﻿ / ﻿78.683°N 110.000°W﻿ / 78.683; -110.000﻿ (Canada) Canada Northwest Territories / Nunavut border — Borden Island 78°19′N 110°0′W﻿ / ﻿78.317°N 110.000°W﻿ / 78.317; -110.000﻿ (Wilkins Strait) Wilkins Strait 78°7′N 110°0′W﻿ / ﻿78.117°N 110.000°W﻿ / 78.117; -110.000﻿ (Canada) Canada Northwest Territories / Nunavut border — Mackenzie King Island 77°55′N 110°0′W﻿ / ﻿77.917°N 110.000°W﻿ / 77.917; -110.000 Unnamed waterbody 76°28′N 110°0′W﻿ / ﻿76.467°N 110.000°W﻿ / 76.467; -110.000﻿ (Canada) Canada Northwest Territories / Nunavut border — Melville Island 76°14′N 110°0′W﻿ / ﻿76.233°N 110.000°W﻿ / 76.233; -110.000﻿ (Eldridge Bay) Eldridge Bay 75°54′N 110°0′W﻿ / ﻿75.900°N 110.000°W﻿ / 75.900; -110.000﻿ (Canada) Canada Northwest Territories / Nunavut border — Melville Island (for about 2 km) 75°53′N 110°0′W﻿ / ﻿75.883°N 110.000°W﻿ / 75.883; -110.000﻿ (Sabine Bay) Sabine Bay 75°33′N 110°0′W﻿ / ﻿75.550°N 110.000°W﻿ / 75.550; -110.000﻿ (Canada) Canada Northwest Territories / Nunavut border — Melville Island 74°50′N 110°0′W﻿ / ﻿74.833°N 110.000°W﻿ / 74.833; -110.000﻿ (Parry Channel) Parry Channel Viscount Melville Sound 72°59′N 110°0′W﻿ / ﻿72.983°N 110.000°W﻿ / 72.983; -110.000﻿ (Canada) Canada Northwest Territories / Nunavut border — Victoria Island Nunavut — from 70°0′N 110°0′W﻿ / ﻿70.000°N 110.000°W﻿ / 70.000; -110.000﻿ (Nunavut) on Victoria Island 68°37′N 110°0′W﻿ / ﻿68.617°N 110.000°W﻿ / 68.617; -110.000﻿ (Coronation Gulf) Coronation Gulf 68°6′N 110°0′W﻿ / ﻿68.100°N 110.000°W﻿ / 68.100; -110.000﻿ (Canada) Canada Nunavut — Jameson Islands and the mainland Northwest Territories — from 65°10′N 110°0′W﻿ / ﻿65.167°N 110.000°W﻿ / 65.167; -110.000﻿ (Northwest Territories), passing through the Great Slave Lake Saskatchewan — from 60°0′N 110°0′W﻿ / ﻿60.000°N 110.000°W﻿ / 60.000; -110.000﻿ (Saskatchewan), passing through Lake Athabasca, around 400m east of the Alberta border 49°0′N 110°0′W﻿ / ﻿49.000°N 110.000°W﻿ / 49.000; -110.000﻿ (United States) United States Montana Wyoming — from 45°1′N 110°0′W﻿ / ﻿45.017°N 110.000°W﻿ / 45.017; -110.000﻿ (Wyoming) Utah — from 41°1′N 110°0′W﻿ / ﻿41.017°N 110.000°W﻿ / 41.017; -110.000﻿ (Utah) Arizona — from 37°0′N 110°0′W﻿ / ﻿37.000°N 110.000°W﻿ / 37.000; -110.000﻿ (Arizona) 31°20′N 110°0′W﻿ / ﻿31.333°N 110.000°W﻿ / 31.333; -110.000﻿ (Mexico) Mexico Sonora — passing just west of Ciudad Obregón at 27°29′N 109°56′W﻿ / ﻿27.483°N 109.933°W﻿ / 27.483; -109.933﻿ (Ciudad Obregón) 27°4′N 110°0′W﻿ / ﻿27.067°N 110.000°W﻿ / 27.067; -110.000﻿ (Gulf of California) Gulf of California 24°8′N 110°0′W﻿ / ﻿24.133°N 110.000°W﻿ / 24.133; -110.000﻿ (Mexico) Mexico Baja California Sur 22°53′N 110°0′W﻿ / ﻿22.883°N 110.000°W﻿ / 22.883; -110.000﻿ (Pacific Ocean) Pacific Ocean 60°0′S 110°0′W﻿ / ﻿60.000°S 110.000°W﻿ / -60.000; -110.000﻿ (Southern Ocean) Southern Ocean 74°27′S 110°0′W﻿ / ﻿74.450°S 110.000°W﻿ / -74.450; -110.000﻿ (Antarctica) Antarctica Unclaimed territory — passing through the Walgreen Coast of Marie Byrd Land