The sea monster Charybdis was believed to live under a small rock on one side of a narrow channel. Opposite her was Scylla, another sea-monster, that lived inside a much larger rock. The sides of the strait were within an arrow shot of each other, and sailors attempting to avoid one of them would come in reach of the other. 'Between Scylla and Charybdis' thus means to having to choose between two dangers, either of which brings harm. Three times a day, Charybdis swallowed a huge amount of water, before belching it back out again, creating large whirlpools capable of dragging a ship underwater. In some variations of the story, Charybdis was simply a large whirlpool instead of a sea monster.
A later myth makes Charybdis the daughter of Poseidon and Gaia and living as a loyal servant to Poseidon. She aided him in his feud with Zeus, and as such, helped him engulf lands and islands in water. Zeus, angry for the land she stole from him, cursed her into a hideous bladder of a monster, with flippers for arms and legs, and an uncontrollable thirst for the sea. As such, she drank the water from the sea thrice a day to quench it, which created whirlpools. She lingered on a rock with Scylla facing her directly on another rock, making a strait.
The theoretical size of Charybdis remains unknown, yet in order to consume Greek ships the whirlpool can be estimated to about 75 feet across. Charybdis has been associated with the Strait of Messina, off the coast of Sicily and opposite a rock on the mainland identified with Scylla. Were Charybdis to be located in the Strait of Messina it would in fact have the size to accommodate the whirlpool. A whirlpool does exist there, caused by currents meeting, but it is seldom dangerous.
References in ancient literature
At many points within the poem, Odysseus is hindered by the efforts of Poseidon and the sea monsters throughout the ocean. Odysseus faced both Charybdis and Scylla in Homer's Odyssey while rowing through a narrow channel. He ordered his men to avoid Charybdis thus forcing them to pass near Scylla, which resulted in the death of six of his men.
Later, stranded on a raft, Odysseus was swept back through the strait to face Scylla and Charybdis once more. This time, Odysseus passed near Charybdis. His raft was sucked into Charybdis' maw, but he survived by clinging to a fig tree growing on a rock over her lair. On the next outflow of water, his raft was expelled. Odysseus recovered it and paddled away safely.
Jason and The Argonauts
Aristotle tells a story of Aesop in conflict with a ferryman and relating to him a myth about Charybdis. She took one gulp of the sea and brought the mountains to view; islands appeared one after another. The third will dry the sea altogether.
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