Solution:Istanbul is located in the peninsular area of Turkey whose three sides are surrounded by Marmara Sea, Bosporus Straits and Golden Horn. It is also known as the Gateway to the West. Istanbul is known as the Gateway to the West.Istanbul's historical core, known as the "Historical Peninsula," is situated on a landmass surrounded by water on three sides. To the south, the Sea of Marmara, a small inland sea, forms a natural boundary.
The Bosphorus Strait, a waterway that connects the Black Sea to the Sea of Marmara, separates the European part of Istanbul from its Asian part. The Golden Horn, a natural harbor, separates the old city (Suriçi) from the modern city of Beyoğlu.
This location has historically made Istanbul a vital trade and defense hub, as it controls access between Europe and Asia. Istanbul is one of the few cities in the world that straddles two continents, with parts of the city located in both Europe and Asia.