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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.
The Caspian Sea is the largest by both area and volume. Although it is about 1/3 as salty as the Ocean so it is still considered a sea, not a lake by some. Lake Baikal in Russia is the deepest lake in the world and is the largest FRESH WATER lake in the world (by volume). So really, both answers are right. Source(s): http://en.wikipedia.org/wiki/Lake_Baikal http://en.wikipedia.org/wiki/Caspian_sea.