No, the Black Sea is North of Turkey. The Sea of Marmara is way smaller and is located between the Aegean Sea and the Black Sea. The Black Sea and the Sea of Marmara are separated by a strip of land in Turkey. Located here is the Capital city of Istanbul (formerly Constantinople). These two seas made the ancient city of Constantinople prosperous.
They are separate bodies of water in and beyond the Mediterranean Sea
Turkey is surrounded by four major bodies of water: the Black Sea to the north, the Aegean Sea to the west, the Mediterranean Sea to the south, and the Sea of Marmara, which connects the Black Sea to the Aegean Sea through the Bosporus Strait.
Constantinople was the largest and richest urban center in the Eastern Mediterranean Sea during the late Eastern Roman Empire, mostly as a result of its strategic position commanding the trade routes between the Aegean Sea and the Black Sea.
Turkeys has two straits: The Bosporus, connecting the Black Sea to the Marmara Seas, and the Dardanelles, linking the Marmara and Aegean Seas.
Aegean sea
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.
Ionean Sea, Mediterranean Sea, and Aegean Sea
Turkey has borders with black sea, marmara sea, aegean sea and mediterranean sea
Istanbul lies on an isthmus between the Black and the Aegean Seas.
aegean sea
These are the Marmara Sea and the Aegean Sea.