The meridian 80° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Atlantic Ocean, the Caribbean Sea, Panama, South America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole.^[1]

In Antarctica, the meridian defines the western limit of the British territorial claim and passes through the Chilean claim - the two claims overlap.

The 80th meridian west forms a great circle with the 100th meridian east.

Starting at the North Pole and heading south to the South Pole, the 80th meridian west passes through:

More information Co-ordinates, Country, territory or sea ...

Co-ordinates	Country, territory or sea	Notes
90°0′N 80°0′W	Arctic Ocean
82°56′N 80°0′W	Canada	Nunavut — Ellesmere Island
76°14′N 80°0′W	Jones Sound	Passing just west of Coburg Island, Nunavut,  Canada (at 75°52′N 79°45′W)
75°33′N 80°0′W	Canada	Nunavut — Devon Island and Philpots Island
74°50′N 80°0′W	Baffin Bay
73°44′N 80°0′W	Canada	Nunavut — Bylot Island
72°53′N 80°0′W	Eclipse Sound
72°31′N 80°0′W	Canada	Nunavut — Imiliit and Baffin Island
69°57′N 80°0′W	Murray Maxwell Bay
69°44′N 80°0′W	Canada	Nunavut — Kapuiviit
69°30′N 80°0′W	Foxe Basin
65°30′N 80°0′W	Foxe Channel	Passing just east of Southampton Island, Nunavut,  Canada (at 63°46′N 80°9′W)
63°4′N 80°0′W	Hudson Bay
62°19′N 80°0′W	Canada	Nunavut — Mansel Island
61°43′N 80°0′W	Hudson Bay
59°53′N 80°0′W	Canada	Nunavut — Gilmour Island
59°48′N 80°0′W	Hudson Bay	Passing just west of Split Island, Nunavut,  Canada
56°19′N 80°0′W	Canada	Nunavut — Kugong Island and Flaherty Island
55°54′N 80°0′W	Hudson Bay
54°41′N 80°0′W	James Bay
53°23′N 80°0′W	Canada	Nunavut — North Twin Island
53°14′N 80°0′W	James Bay	Passing just west of South Twin Island, Nunavut,  Canada (at 53°7′N 79°56′W)
51°14′N 80°0′W	Canada	Ontario
42°48′N 80°0′W	Lake Erie
42°10′N 80°0′W	United States	Pennsylvania — passing through Pittsburgh (at 40°26′N 80°0′W) West Virginia — from 39°43′N 80°0′W Virginia — from 38°0′N 80°0′W North Carolina — from 36°32′N 80°0′W South Carolina — from 34°48′N 80°0′W, passing through Charleston (at 32°52′N 80°0′W)
32°37′N 80°0′W	Atlantic Ocean	Passing just east of Palm Beach, Florida,  United States (at 26°42′N 80°1′W) Passing through the Cay Sal Bank atoll,  Bahamas (at 24°4′N 80°0′W)
23°3′N 80°0′W	Cuba
21°44′N 80°0′W	Caribbean Sea
19°43′N 80°0′W	Cayman Islands	Island of Little Cayman
19°42′N 80°0′W	Caribbean Sea
9°20′N 80°0′W	Panama
8°26′N 80°0′W	Gulf of Panama
7°31′N 80°0′W	Panama	Passing through the tip of the Azuero Peninsula
7°28′N 80°0′W	Pacific Ocean
0°49′N 80°0′W	Ecuador	The mainland, Puná Island, and the mainland again
4°22′S 80°0′W	Peru	Piura Region Lambayeque Region — from 5°41′S 80°0′W
6°44′S 80°0′W	Pacific Ocean	Passing close between the Desventuradas Islands,  Chile (at 26°19′S 80°0′W) Passing some distance between the Juan Fernández Islands,  Chile (at 33°40′S 80°0′W)
60°0′S 80°0′W	Southern Ocean
73°2′S 80°0′W	Antarctica	Defines the western limit of British Antarctic Territory, claimed by  United Kingdom Passes through Antártica Chilena Province, claimed by  Chile

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• 79th meridian west
• 81st meridian west