Kocaeli is a province of Turkey. Its capital is Izmit, which is sometimes referred to as Kocaeli itself. The largest town in the province is now Gebze. It has a Refinery and major automobile factories are located in the area. Also there is a ski resort nearby.
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The province is located at the easternmost end of the Marmara Sea, especially on the Bay of Izmit. Because of the size and natural conditions of the Bay of Izmit, the city is a giant natural harbour.