Kocaeli_Peninsula
Kocaeli Peninsula
Northwestern Turkey peninsula
The Kocaeli Peninsula (Turkish: Kocaeli Yarımadası) lies in the northwest corner of Anatolia, Turkey, separating the Black Sea and the Sea of Marmara on the Asian side of the strait of Bosphorus. Approximately one-third of Istanbul, one of the most populous cities of the world, occupies its western part, and İzmit, another big city, is at the easternmost point of the peninsula.