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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.
The 18th meridian west forms a great circle with the 162nd meridian east.
From Pole to Pole
Starting at the North Pole and heading south to the South Pole, the 18th meridian west passes through:
References
18th meridian west Wikipedia(Text) CC BY-SA