In Greek myth, Alpheus is a river deity, son of Oceanus and Tethys. He fell madly in love with the Nereid Arethusa and pursued her under the sea to Sicily. Here she pleaded to Artemis who changed her into a fountain. The river Alpheus then worked its way underground to mingle with the waters of Arethusa.
The river Alpheus flows through Arcadia and Elis into the Ionian Sea.