Sonus
Σῶνος
Sonus (Σῶνος, Arrian Ind. chap. 4; Plin. Nat. 6.18. s. 22), a principal affluent of the Ganges, which flows in a NE. direction to it from the Vindhya Mountains. Its modern name is Soane. There is no doubt that it has been contracted from the Sanscrit Suvarna, golden. The Soas (Σῶας of Ptolemy (7.1.30) is certainly the same river.
From William Smith (ed.), Dictionary of Greek and Roman Geography. Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities and Tufts University. Data accessed from https://github.com/PerseusDL/canonical-pdlrefwk/ on 17 October 2026.