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 barbeque to hungry visitors. Ample picnic facilities and a nature trail are also available.
Your Lost Sea adventure begins with a guided tour of the caverns. This involves a ¾ mile round-trip walk on wide sloping pathways. While touring the caverns and underground lake our guides will tell of the cavern’s exciting and colorful history. They will also explain the fascinating geological development of the immense cavern rooms and rare formations. At the bottom of the cave you will board a glass-bottom boat for an exciting trip on the Lost Sea, America’s Largest underground lake.
140 Lost Sea Road Sweetwater, TN 37874
Monday - Sunday:
9:00 am - 7:00 pm