140 Lost Sea Rd, Sweetwater, TN 37874-6724

The Lost Sea is open daily except Thanksgiving Day and Christmas Day. The Lost Sea is America's Largest Underground Lake. All tours are guided tours and last for approximately one hour and twenty minutes. Reservations are not required. The adult rate is $21.95 and children 4-12 are $12.95 children 3 and under are free. We do offer a group rate for groups of 15 or more. We also offer a Wild Cave Adventure tour for groups of 12 or more. You may even spend the night on the Wild Cave Tour. The Lost Sea is also a Civil War Trail Marker. The oldest known date in the cave is a date of 1863. This date has been carbon tested and does prove to be an authentic date.