Lycastus or Lykastos (), also known as Lycastum or Lykaston, was an ancient Greek cityPseudo Scylax, Periplous, § 89 in ancient Pontus, on a river bearing the same name. It was situated 20 stadia southeast of Amisus.Periplus of Pseudo-Scylax 89; Marcian, p. 74; Periplus of the Euxine Sea p. 10; Pomponius Mela calls the town Lycasto. Pherecydes spoke of a town of Lycastia, inhabited by Amazons, and situated between Themiscyra and Chalybia.Pherecydes ap. Schol. ad Apoll. Rhod. 2.373, comp. ad 2.1001. The river Lycastus was but a small stream, which after a short course emptied itself into the Euxine close by the town of Lycastus.Periplus of Pseudo-Scylax 89; Marcian, p. 74.

The Lycastrus River is identified with the modern Mert River, in Samsun Province, Turkey, but the townsite is treated as unlocated, but likely along that river.

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