The Celtic Sea (Irish: An Mhuir Cheilteach; Welsh: Y Môr Celtaidd; Cornish: An Mor Keltek; French: La Mer Celtique) is the area of the Atlantic Ocean off the south coast of Ireland. To the east of it are the Saint George's Channel, the Bristol Channel, the English Channel, and the Bay of Biscay, as well as adjacent portions of Wales, Cornwall, Devon, and Brittany. The southern and western boundaries are based on the continental shelf.
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- Coccoliths in the Celtic Sea: a bloom of phytoplankton in the Celtic Sea, visible from outer space in an MISR image, 4 June 2001