Cales or Kales (Ancient Greek: Κάλης), also Calles or Kalles (Κάλλης), was a river of ancient Bithynia. At its mouth was the town of Cales, located 120 stadia east of Elaeus.[1][2] This seems to be the river which Thucydides calls Calex (Κάληξ), at the mouth of which Lamachus lost his ships, which were anchored there, owing to a sudden rise of the river.[3] Thucydides places the Calex in the Heracleotis, which agrees very well with the position of the Cales. Lamachus and his troops were compelled to walk along the coast to Chalcedon.[3] Pliny the Elder mentions a river Alces in Bithynia, which it has been conjectured, may be a corruption of Calex.[4]
It is identified with the modern Alaplı Su in Asiatic Turkey.[5]