18th meridian west
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The meridian 18° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Greenland, Iceland, the Atlantic Ocean, the Canary Islands, the Southern Ocean, and Antarctica to the South Pole.
From Pole to Pole 
Co-ordinates Country, territory or sea Notes Arctic Ocean Greenland Prinsesse Margrethe Island, Prinsesse Dagmar Island, and mainland Atlantic Ocean Greenland Sea Greenland Bourbon Island Atlantic Ocean Greenland Sea Greenland Ile de France Atlantic Ocean Greenland Sea Greenland Shannon Island Atlantic Ocean Greenland Sea Iceland Island of Grímsey Atlantic Ocean Iceland Atlantic Ocean Spain Island of La Palma Atlantic Ocean Spain Island of El Hierro Atlantic Ocean Southern Ocean Antarctica Queen Maud Land, claimed by Norway
See also