| Celtic Sea | |
|---|---|
 Bathymetric map of the Celtic Sea, part of the Atlantic Ocean, and its surroundings | |
| Location | Northwestern Europe |
| Coordinates | 50°N 8°W / 50°N 8°W |
| Type | Sea |
| Basin countries | Ireland, England, Wales, France |
| Surface area | 300,000 km2 (120,000 sq mi) |
The Celtic Sea[a] is the area of the Atlantic Ocean off the southern coast of Ireland bounded to the north by Saint George's Channel;[1] other limits include the Bristol Channel, the English Channel, and the Bay of Biscay, as well as adjacent portions of Wales, Cornwall, and Brittany. The continental shelf, which drops away sharply, delimits the southern and western boundaries. The Iroise Sea off Brittany is entirely included within it. The Isles of Scilly are an archipelago of small islands in the sea.
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