Pratomysia was a Roman town of ancient Bithynia. Its name does not occur in ancient authors but is inferred from epigraphic and other evidence.
Its site is located near Gacık, Asiatic Turkey.
Coordinates: 40°36′40″N 29°20′38″E / 40.611226°N 29.343911°E / 40.611226; 29.343911
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