Cyaneus

CYA´NEUS(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. 2. p. 915) speaks of a castle called Goniehin the neighbourhood, which perhaps confirms the original form of the word Gyenus.
[V]