Speculations on the historical source of these stories include a meteor, a tsumani caused by the eruption of Thera and changing water levels after the last ice age. There is no geological evidence in Mesopotamia or Israel of a universal, catastrophic flood.
The flood story word-clouds below (created using Wordle), are Mesopotamian, Greek and biblical. Identify which is which in the comments to win a $5 Amazon gift card.
Extra credit for explaining your reasoning, making a good pun or identifying a common ark-etype.
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Good luck!
Update 1/9: won via Facebook! More coming soon..boatcha coulda got it if you trid-ent!