The Abianus () was a river of Scythia (Sarmatia) falling into the Euxine, mentioned only in the work of Alexander Polyhistor, On the Euxine Sea, mentioned by Stephanus of Byzantium as giving name to the Abii, who dwelt on its banks. Stephanus elsewhere quotes Alexander as saying that the district of Hylea on the Euxine was called á¼Âòùúî, which he interprets by á½Âûñïñ, woody.