The meridian 10° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, the Atlantic Ocean, Ireland, Africa, the Southern Ocean, and Antarctica to the South Pole.
Between 1939 and 1945 the meridian defined the western limit of New Swabia, Nazi Germany's Antarctic territorial claim.
Starting at the North Pole and heading south to the South Pole, the 10th meridian west passes through:
| Country, territory or sea | Notes |
|---|---|
| Arctic Ocean | |
| Atlantic Ocean | |
| Mullet Peninsula, Achill Island, Clare Island and Connemara | |
| Atlantic Ocean | |
| Dingle, Iveragh and Beara Peninsulas | |
| Atlantic Ocean | |
| Western Sahara | Claimed by |
| Atlantic Ocean | |
| Gough Island | |
| Atlantic Ocean | |
| Southern Ocean | |
| Antarctica | Queen Maud Land, claimed by |
|
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