12th meridian west
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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.
From Pole to Pole
Co-ordinates Country, territory or sea Notes Arctic Ocean Greenland Atlantic Ocean Morocco Western Sahara Claimed by Morocco and the Sahrawi Arab Democratic Republic Western Sahara / Mauritania border Mauritania Mali Senegal For about 13km Mali For about 11km Senegal Mali Senegal Guinea Sierra Leone Atlantic Ocean Passing just east of the island of Tristan da Cunha, Saint Helena, Ascension and Tristan da Cunha (at ) Southern Ocean Antarctica Queen Maud Land, claimed by Norway