Hyssus or Hyssos (Ancient Greek: Ὕσσος), also known as Hyssi portus, or Susarmia or Sousarmia (Σουσάρμια),[1] or Susurmaena or Sousourmaina (Σουσούρμαινα),[2] was a port-town of ancient Pontus on the Black Sea coast, at the mouth of the Hyssus River, 180 stadia east of Trapezus.[3][4] The Tabula Peutingeriana calls it Hyssilime. It seems to have been a place of some importance; for it was fortified, and had the "cohors Apuleia civium Romanorum" for its garrison.[5] Other names borne by the town include Psoron Limen (Ψωρῶν λιμήν), Sousourmena, and Ysiporto.[6]
Its site is located near Araklıçarşısı in Asiatic Turkey.[7][6]