Bosporus n. (Written also Bosphorus) A strait or narrow sea between two seas, or a lake and a seas; as, the Bosporus (formerly the Thracian Bosporus) or Strait of Constantinople, between the Black Sea and Sea of Marmora; the Cimmerian Bosporus, between the Black Sea and Sea of Azof.
... west of the Bosporus is sometimes included with Europe), bordering the Black Sea, between Bulgaria and Georgia, and bordering the Aegean Sea and the Mediterranean Sea, between Greece ... — The 1998 CIA World Factbook • United States. Central Intelligence Agency.
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