Mythical Island is a term used to describe two legendary islands, ATLANTIS and AVALON. ATLANTIS is an island first mentioned in Plato's dialogues Timaeus and Critias, written in 360 BC. It is described as a utopian island civilization that was destroyed by a great flood. AVALON is a legendary island featured in the Arthurian legend. It is said to be the place where King Arthur's sword Excalibur was forged, and where he was taken to recover from his wounds after the Battle of Camlann.