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Craighead Caverns is an extensive cave system located in between Sweetwater and Madisonville, Tennessee. It is best known for containing the United States' largest and the world's second largest non-subglacial underground lake, The Lost Sea. In addition to the lake, the caverns contain an abundance of crystal clusters called anthodites, stalactites, stalagmites, and a waterfall.
Sweetwater, Tennessee. The Lost Sea claims to be America's largest underground body of water. Fed by multiple subterranean sources, its extent is unknown, but its upper chamber has water that covers 4.5 acres at depths of 70 feet.