Ys was a legendary sunken kingdom, located off the coast of Brittany. It has been pointed out that ‘ys’ in some of the Celtic languages means ’island’. This has led to the suggestion that ’Atlantis’ could therefore be a corruption of ’Atlantic island’. What is interesting in this regard is the persistent theory that megalithic Brittany had been part of the Atlantean
realms, if not the location of its capital.

This legend has echoes in the mythologies of virtually all other ancient peoples along the European seaboard of the Atlantic.