The Lost Sea is America’s largest underground lake and Registered National Landmark located in beautiful Sweetwater, Tennessee. We are open every day of the year for tours (except Christmas Day). You will love our General Store, Ice Cream Parlor, Gem Mine and Glassblower. Our cafe, the Cavern Kitchen, offers sandwiches and real pit barbecue to hungry visitors. Ample picnic facilities and a nature trail are also available.
The Lost Sea is also a member of the National Cave Association, which stresses preservation of these glorious natural resources.
Closed Thanksgiving Day and Christmas Day
The Lost Sea is located in Sweetwater on Hwy. 68, just seven miles off I-75, exit #60.
Lost Sea
140 Lost Sea Road
Sweetwater, TN 37874
(423) 333-2289
