Bartın River (Bartın Çayı), anciently known as Parthenius or Parthenios (Ancient Greek: Παρθένιος), is a small river in the east of the Black Sea Region of Turkey.
The river flows to the north, passes through Bartın, and empties into the Black Sea near Boğaz village in a delta.
The river has its sources on Mount Olgassys, and in its northwestern course formed the boundary between Paphlagonia and Bithynia.
It empties itself into the Euxine (Black Sea) about 90 stadia west of Amastris.
This article about a Black Sea Region of Turkey location is a stub.