The Bosphorus or Bosporus is the strait between the Black Sea and the Marmama Sea.
Bosporus
Bosporus
The Strait of Bosporus links the Black Sea and the Sea of Marmara
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.
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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
To go from the Aegean Sea to the Black Sea, you would pass through the Dardanelles Strait and the Bosporus Strait. The Dardanelles connects the Aegean Sea to the Sea of Marmara, and the Bosporus connects the Sea of Marmara to the Black Sea.