- a sea in NW Turkey, between European and Asian Turkey, connected with the Black Sea by the Bosporus, and with the Aegean by the Dardanelles. 4,300 sq. mi. (11,135 sq. km).
- a deep inland sea in NW Turkey, linked with the Black Sea by the Bosporus and with the Aegean by the Dardanelles: separates Turkey in Europe from Turkey in Asia. Area: 11 471 sq km (4429 sq miles)
