Odyssey Book 12
Odysseus and his men have to navigate through either Scylla a six headed monster, or Charybdis a whirlpool. He chooses to go through Scylla which eats 6 of his men.
The place in the real world
Strait of Messina
Proof and evidences
A lot of streams causing a lot of whirlpools and a massive rock protect the village of Scylla.