What is the largest underground lake in the United States?

Deep inside a mountain near Sweetwater in East Tennessee is a remarkable body of water known as The Lost Sea. Listed by the Guinness Book of World Records as America's largest underground lake, the Lost Sea is part of an extensive and historic cave system called Craighead Caverns.



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The Dragon's Breath cave is the largest non subglacial lake in the world. It was discovered in 1986 by the South African Speleological Association. Vostok Lake of Antarctica is the largest subglacial lake in the world.

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At 1,943 feet (592 meters), Crater Lake is the deepest lake in the United States and one of the deepest in the world. The depths were first explored thoroughly in 1886 by a party from the U.S. Geological Survey.

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Flathead Lake, Montana is so clear that it looks shallow but is actually 370 feet deep.

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Deep in the west Texas desert lies Phantom Springs Cave. Exploration divers there hit a record depth of 462 ffw / 140.8 m, making it the deepest underwater cave system in the United States!

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Alaska is home to more than 3 million lakes, covering over 5 percent of the state's total land area.

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Lake Michigan, the third largest by surface area (22,300 square miles) and second largest by volume (1,180 cubic miles), is the only Great Lake located entirely within the United States.

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The Great Lakes aren't all that great, in terms of depth anyway. At over a mile deep (1,642 meters or 5,387 feet) Lake Baikal in the Russian region of Siberia is the deepest lake in the world.

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The Weddell Sea has been claimed by scientists to have the clearest waters of any ocean in the world. Described by a historian as “the most wretched and dismal region on earth”, due to the flash freezes that caught Shackleton's ship, its clarity is only belied by the sheer depth of the ocean below.

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Are there any states with no lakes? The only state in the US with no natural lakes is Maryland. Although Maryland has rivers and other freshwater ponds, no natural body of water is large enough to qualify as a lake.

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1. Lake Mead, Nevada. Named after Bureau of Reclamation Commissioner Elwood Mead, Lake Mead is the largest reservoir in the United States, stretching 112 miles long with a total capacity of 28,255,000 acre-feet, a shoreline of 759 miles, and a maximum depth of 532 feet.

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Lake Erie. The fourth largest out of the five Great lakes, Erie is also the shallowest and the smallest in volume. In terms of surface area, Erie takes thirteenth place in the world. Niagara River is its biggest natural outflow, providing a huge amount of hydroelectric power to both the United States and Canada.

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