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The Bosporus /ˈbÉ’spÉ™rÉ™s/ or Bosphorus /-pÉ™r-, -fÉ™r-/;[a] Ancient Greek: ΒόσποÏος Bosporos [bós.po.ros]; Turkish: Ä°stanbul BoÄŸazı `Istanbul strait`, colloquially BoÄŸaz, is a narrow, natural strait and an internationally significant waterway located in northwestern Turkey. It forms part of the continental boundary between Asia and Europe, and divides Turkey by separating Anatolia from Thrace. It is the world`s narrowest strait used for international navigation. The Bosporus connects the Black Sea with the Sea of Marmara, and, by extension via the Dardanelles, the Aegean and Mediterranean seas