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Known as Qazvin in the ancient times, the Caspian sea is surrounded by southern Russia, Turkmenistan, Northern Iran, Azerbaijan and Kazakhstan. Its surface area is 371,000 square kilometers and the volume is 78200 cubic kilometers. World\’s 40-44% of the lake water is accounted for by the Caspian Sea. Around 130 rivers are a source of water inflow for the sea and it is due to this inflow that the northern region of the sea acts like a fresh water lake. The Northern region comprises of a couple of islands accounting for a total land area of around 2000 square kilometers. Caspian Sea is often listed as the world\’s largest lake since it is the largest enclosed body of water on Earth. Caspian Sea is rich in oil fields and natural gases which results in great pollution from toxic wastes by countries like Russia and Azerbaijan.