Ys (Kêr-Is in Breton) was a legendary sunken kingdom, located off the coast of Brittany. However, ‘skerry’ and its cognates also mean a rocky island, so ‘Kêr’ may be just another variant. 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. The Ys legend has echoes in the mythologies of virtually all other ancient peoples along the European seaboard of the Atlantic.