Rhidagus
Rhidagus (Curt. 6.4.7), a river of Hyrcania, which flows from the mountains NW. to the Caspian. Alexander crossed it on his march in pursuit of Dareius. It appears to be the same as the Choatres of Ammianus (23.24), and may perhaps be represented by the present Adjisu.
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.