The Enipeus River was one of the tributories of the Peneios (others included Titaressos, and Apidanos). It flowed from Mount Oita in Phthiotis, north through the southern half of Thessalia.
Enipeus was loved by a mortal woman named Tyro, daughter of Salmoneus. Tyro pursued Enipeus, who refused her advances. On day, Poseidon ,the sea god, filled with lust for Tyro, disguised himself as Enipeus and from their union was born Pelias and Neleus, twins boys.