BATHY´NIAS(Βαθύνιας), a river in Thrace, emptying itself into the Propontis not far from Byzantium. (Plin. Nat. 4.18; Ptol. 3.11.6.) This river is probably the same as the one called Bathyrsus by Theophanes (vol. 5. p. 340, ed. Bonn), and Bithyas by Appian ( Mithrid. 1).
[L.S]