110th meridian west

110°

110th meridian west

In Canada, the 110th meridian west defines part of the border between the Northwest Territories and Nunavut, and it approximately defines the border between Alberta and Saskatchewan.

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
	Arctic Ocean
	Canada	Northwest Territories / Nunavut border — Borden Island
	Wilkins Strait
	Canada	Northwest Territories / Nunavut border — Mackenzie King Island
	Unnamed waterbody
	Canada	Northwest Territories / Nunavut border — Melville Island
	Eldridge Bay
	Canada	Northwest Territories / Nunavut border — Melville Island (for about 2 km)
	Sabine Bay
	Canada	Northwest Territories / Nunavut border — Melville Island
	Parry Channel	Viscount Melville Sound
	Canada	Northwest Territories / Nunavut border — Victoria Island Nunavut — from on Victoria Island
	Coronation Gulf
	Canada	Nunavut — Jameson Islands and the mainland Northwest Territories — from , passing through the Great Slave Lake Saskatchewan — from , passing through Lake Athabasca, around 400m east of the Alberta border
	United States	Montana Wyoming — from Utah — from Arizona — from
	Mexico	Sonora
	Gulf of California
	Mexico	Baja California Sur
	Pacific Ocean
	Southern Ocean
	Antarctica	Unclaimed territory — passing through the Walgreen Coast of Marie Byrd Land

See also

• 109th meridian west
• 111th meridian west