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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.
Tennessee Sinkhole Risk. KNOXVILLE, Tenn. (WVLT) Tennessee happens to be one of the top 5 states with the highest risk for sinkholes. Sinkholes like the ones that have formed recently in Florida are caused by ground water eroding soft rock such as limestone several feet below the surface.