The Bosphorus (/ˈbɒsfərəs/) or Bosporus (/ˈbɒspərəs/; Ancient Greek: Βόσπορος, Bósporos; Turkish: Boğaziçi) is a strait that forms part of the boundary between Europe and Asia. The Bosphorus, the Sea of Marmara, and the Dardanelles strait to the southwest together form the Turkish Straits.