SONAUTES according to Pliny (6.1), a river in Pontus; while, according to Apollonius Rhodius (2.747), the Acheron in Bithynia was anciently called Soonautes (Σοωναύτης). [L.S]
Dictionary of Greek and Roman Geography, illustrated by numerous engravings on wood. William Smith, LLD. London. Walton and Maberly, Upper Gower Street and Ivy Lane, Paternoster Row; John Murray, Albemarle Street. 1854.