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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.
At more than 25 million years old, it is the oldest lake in the world. Lake Titicaca is a lake located on the border of Bolivia and Peru. It sits 3,812 m (12,500 ft) above sea level making it the highest commercially navigable lake in the world. By volume of water it is also the largest lake in South America.