Cyaneus
Κυάνεος
Cyaneus (Κυάνεος, Ptol. 5.10.2; Plin. Nat. 6.3. 4), a river of Colchis, a little to the south of Dioscurias. According to Pliny, it must have been a river of some size; and he designates both it and the Hippus, which fell into the Euxine near it, as vasti amnes.
It has been conjectured that it is the same river which Scylax (p. 32) called the Gyenus (or, according to Gail's reading, Tyenus). Ritter (Erdk. vol. ii. p. 915) speaks of a castle called Gonieh in the neighbourhood, which perhaps confirms the original form of the word Gyenus.
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.