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Lake Superior empties into Lake Huron via the St. Marys River and the Soo Locks. Lake Superior is the largest freshwater lake in the world based on surface area (if Lakes Michigan and Huron are taken separately; see Lake Michigan-Huron), and the third largest in volume, behind Lake Baikal in Russiaand Lake Tanganyika in Africa. The Caspian Sea, while larger than Lake Superior in both surface area and volume, is brackish; though presently isolated, historically the Caspian has been repeatedly connected to and isolated from the Mediterranean via the Black Sea.

Lake Superior has a surface area of 31,700 square miles (82,103 km2), which is approximately the size of South Carolina. It has a maximum length of 350 statute miles (560 km; 300 nmi) and maximum breadth of 160 statute miles (257 km; 139 nmi). Its average depth is 80.5 fathoms (483 ft; 147 m) with a maximum depth of 222 fathoms (1,332 ft; 406 m). Lake Superior contains 2,900 cubic miles (12,100 km³) of water. There is enough water in Lake Superior to cover the entire land mass of North and South America with roughly 1 foot (30 cm) of water (roughly a depth of .93 feet) The shoreline of the lake stretches 2,726 miles (4,387 km) (including islands).

Source: Wikipedia

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