Naustathmus or Naustathmos (Ancient Greek: Ναύσταθμος) was a port-town on the Euxine, in the western part of ancient Pontus, on a salt lake connected with the sea, and 90 stadia to the east of the Halys River.[1][2] The Tabula Peutingeriana calls it Nautagmus. The Anonymous Periplus places it only 40 stadia east of the mouth of the Halys.[3]