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Solving the world's problems. . . one answer at a time. The Caspian Sea is the largest lake in the world at 143,244 square miles. Though it is saltwater, it is land-locked. The largest freshwater lake in the world is Lake Superior at 31,700 square miles. Lake Baical in Russia has the largest freshwater volume in the world at 23,600 km3 (5,700 cu mi), and is also the deepest at 5,370 ft.
1 The largest lake in the world by area is the Caspian Sea, with 394,299 kmÂ². The largest freshwater lake by area is Lake Superior (82,414 kmÂ²), part of the Great Lakes of North America.  The longest freshwater lake is Lake Tanganyika, with a length of about 660 km.