Question: What is the name of the island originating in Celtic mythology believed to lie somewhere in the Atlantic Ocean west of Ireland?
Sentence (from "Fortunate Isles"): Later on the islands were said to lie in the Western Ocean near the encircling River Oceanus; Madeira, the Canary Islands, the Azores, Cape Verde, Bermuda, and the Lesser Antilles have sometimes been cited as possible matches.
Relevant evidence: No