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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 world's largest lake is the Caspian Sea which â¦ is completely enclosed by Russia, Iran, Kazakhstan, Turkmenistan and Azerbaijan.   The world's deepest lake is Lake Baikal in Siberia, Russia, at 1,638 metres deep.