The Bosphorus or Bosporus is the strait between the Black Sea and the Marmama Sea.
Bosporus
Bosporus
Leaving the Black Sea you pass the Bosporus Strait, the Sea of Marmara and the Dardanelles Strait before you reach the Aegean Sea.The Sea of Marmara (sometimes spelled Marmora) lies between the Aegean Sea and the Black Sea.
The Strait of Bosporus links the Black Sea and the Sea of Marmara
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The Bosporus Strait.
The Dardanelles/Bosphorus sea route between the Black Sea and the Mediteranean.
The Bosphorus (also called the Istanbul Strait) and the Dardinelles
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Between the Med & the Atlantic the Straits of Gibraltar & to the Black Sea the Dardanelles.
The Bosphoros Strait
The Bosporus Strait, the Sea of Marmara, and the Dardanelles Strait.