The Lost Sea Adventure

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. 

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Visit Us at The Lost Sea!

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.  

The Lost Sea Adventure

140 Lost Sea Road Sweetwater, TN 37874

(423) 337-6616


Monday - Sunday: 

9:00 am - 7:00 pm 

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