Boon () was a port on the Black Sea coast of ancient Pontus, 90 stadia east of Cape Jasonium.
According to William Hamilton, the 19th-century geologist, it was "the best winter harbor on that side of Constantinople, surpassing even Sinope due to its great depth".Dictionary of Greek and Roman Geography (1854), Boon
Its site is located near Perşembe in Asiatic Turkey.
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