Crescent-shaped lake baikal , in siberia , is only the ninth largest lake in area at 385 miles in lenght and 46 miles in width , yet it is easily the largest body of fresh water in the world . It holds one-fifth of the world's total fresh water , which is more thsn the total of all the water in the five great lakes ; it holds so much fresh water in spite of its less-than-ipressive area because it is by far the world's deepest lake . The average depth of the lake is 1,312 feet below sea level , and the olkon crevice , the lowest know point , is more than 5,250 feet deepLake baikal , which today is located near the center of the asian peninsula , is most likely the world's oldest lake . It began forming 25 million years ago as asia started splitting apart in a series of great faults . The baikal valley dropped away , eventually filling with water and creating the deepest of the world's lakes
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