Charybdis

In Greek mythology, Charybdis lurked beneath a small rock on one side of a narrow strait, opposite from her counterpart Scylla. Three times each day, Charybdis would drink vast quantities of seawater, then violently expel it, creating massive whirlpools that could drag entire ships to their doom. Some versions of the tale portrayed her simply as the whirlpool itself rather than a Legendary Creature.

Ancient writers Legendary Placed Charybdis in the Strait of Messina between Sicily and mainland Italy. While a real whirlpool does exist there due to converging currents, it poses a serious threat only to small boats in the worst conditions - unlike its mythological counterpart, which along with Scylla gave rise to the phrase "between Scylla and Charybdis," meaning to face two equally deadly choices.