Calpas or Kalpas, also known as Calpe or Kalpe (Ancient Greek: Κάλπη) was a river of ancient Bithynia draining into the Black Sea, between the Psilis, from which it is 210 stadia distant, and the Sangarius River.
Near its mouth was the port of Calpe, through which Xenophon passed on his retreat with the Ten Thousand.
[1] Xenophon describes it as about halfway between Byzantium and Heraclea Pontica on a promontory, part of which projects into the sea as an abrupt precipice.
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