Nymphaeum or Nymphaion () was a town on the eastern coast of ancient Bithynia located on the Black Sea, at a distance of 30 stadia west of the mouth of the Oxines,Arrian, Periplus Ponti Euxini, p. 14 or 45 stadia from Tyndaridae.Anon. Periplus P. E., p. 4.

Its site is unlocated.

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