The Sea of Marmora is also known as the Marmara Sea, which is located in the northwestern part of Turkey. Another synonym for the Sea of Marmora is Propontis, which was its ancient name. It is connected to the Aegean Sea by the strait of the Dardanelles and the Black Sea by the Bosphorus. It covers an area of approximately 11,350 square kilometers and has an average depth of 758 meters. The Sea of Marmora has played a vital role in history and remains an important waterway today as it is a key link in the international trade route.