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The meridian 12° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Greenland, the Atlantic Ocean, Africa, the Southern Ocean, and Antarctica to the South Pole.
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12°
12th meridian west
The 12th meridian west forms a great circle with the 168th meridian east.
Part of the border between Western Sahara and Mauritania is defined by the meridian.[1]
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Starting at the North Pole and heading south to the South Pole, the 12th meridian west passes through:
| Co-ordinates | Country, territory or sea | Notes |
|---|---|---|
| 90°0′N 12°0′W | Arctic Ocean | |
| 81°37′N 12°0′W |  Greenland |
|
| 81°18′N 12°0′W | Atlantic Ocean | |
| 28°7′N 12°0′W |  Morocco |
|
| 27°40′N 12°0′W | Western Sahara | Claimed by Morocco and the  Sahrawi Arab Democratic Republic |
| 26°0′N 12°0′W | Western Sahara /  Mauritania border |
|
| 23°27′N 12°0′W | Mauritania |
|
| 14°46′N 12°0′W |  Mali |
|
| 14°12′N 12°0′W |  Senegal |
For about 13 km |
| 14°4′N 12°0′W | Mali |
For about 11 km |
| 13°58′N 12°0′W | Senegal |
|
| 13°46′N 12°0′W | Mali |
|
| 13°34′N 12°0′W | Senegal |
|
| 12°24′N 12°0′W |  Guinea |
|
| 9°54′N 12°0′W |  Sierra Leone |
|
| 7°12′N 12°0′W | Atlantic Ocean | Passing just east of the island of Tristan da Cunha,  Saint Helena, Ascension and Tristan da Cunha (at 37°7′S 12°13′W) |
| 60°0′S 12°0′W | Southern Ocean | |
| 71°18′S 12°0′W | Antarctica | Queen Maud Land, claimed by  Norway |
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