Elaeus or Elaious ()Marcian of Heraclea, Peripl. p. 70. or Elaios (Ἐλαῖος) was an emporium or trading place on the coast of Bithynia at the mouth of a river of the same name. Elaeus was 120 stadia west of Cales.

It is located on the north coast of modern Turkey, at the mouth of its name-sake river.

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