Sinope (Turkish Sinub), a seaport on the S. shore of the Black Sea, in the province of Anatolia, Asiatic Turkey. Colonised at least five centuries before Christ by Greeks from Miletus, it was an important place until the decay of Greek and Roman civilisation. It still possesses a naval arsenal, and enjoys some trade in timber, salt, cordage, fish, and oil. Here in 1853 a Turkish fleet was destroyed by a superior Russian force. This was one of the immediate causes of the Crimean War.