Alfeios is Peloponnese’s longest river (111km long) has its source in Arcadia and its mouth in the Prefecture of Elis. According to mythology, Apheus was one of the river-gods of antiquity, worshiped mainly in the regions of Arcadia, Elis and Messinia. Son of Oceanus and Tethys, he killed his brother Cercaphus and haunted by the Erinyes, he leapt into the river which was later named after him.