The Lost Sea: Exploring America's largest underground lake in

Deep in the foothills of the Smoky Mountains, about 50 miles south of Knoxville, Tennessee, sits an wonder 140 feet below ground: the largest underground lake in America

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The Lost Sea in Tennessee: America's Largest Underground Lake - WorldAtlas

The Lost Sea: America's largest underground lake

The Lost Sea Adventure: Exploring America's Largest Underground Lake

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