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The Dardanelles lies between the peninsula of Gallipoli in Europe (northwest) and the mainland of Asia Minor (southeast). It has an average depth of 180 feet (55 metres) and reaches a maximum depth of 300 feet (90 metres) in the narrowest central section.
The Bosporus and Dardanelles are located in Turkey, where the country's European and Asian territories meet, separating them. Here we can see the Bosporus in red and the Dardanelles in yellow. These two straits are the only way in and out of the Black Sea, and represent the closest point between European and Asian lands (that aren't the Urals or Caucasus).