Lycastus or Lykastos (Greek, Ancient (to 1453);: Λύκαστος), also known as Lycastum or Lykaston, was an ancient Greek city[1] in ancient Pontus, on a river bearing the same name. It was situated 20 stadia southeast of Amisus.[2] Pomponius Mela calls the town Lycasto. Pherecydes spoke of a town of Lycastia, inhabited by Amazons, and situated between Themiscyra and Chalybia.[3] The river Lycastus was but a small stream, which after a short course emptied itself into the Euxine close by the town of Lycastus.[4]
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.