Bosporus
noun
a strait connecting the Black Sea and the Sea of Marmara. 18 miles (29 km) long.
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And near twin rocks that guard the Colchian sea,II 1 Bosporian cliffs ’fore Salmydessus rise, Where neighbouring Ares from his shrine beheld Phineus’ two sons by female fury quelled.
From The Seven Plays in English Verse by Sophocles