Deep in the foothills of the Smoky Mountains, about 50 miles south of Knoxville, Tennessee, sits a wonder 140 feet below ground: the largest underground lake in America.

3 days ago · America’s Largest Underground Lake Is Hidden 140 Feet Below the Surface—Here’s How to Visit You can even take a boat across the Lost Sea, deep in Tennessee’s Craighead Caverns …

The Lost Sea is actually a large underground lake that one can tour with a guide on an electric boat with lights. There all sorts of aquatic creatures you can see, including translucent fish where you can …

Nov 4, 2025 · Visitors can access The Lost Sea from its location at 140 Lost Sea Road, Sweetwater, TN 37874. It is conveniently situated on Hwy. 68, just seven miles off of I-75, exit #60.

Nestled in the foothills of the Great Smoky Mountains lies a hidden gem many travelers overlook: The Lost Sea. This remarkable underground lake, located in Sweetwater, Tennessee, holds the title of …

Dec 3, 2025 · Your Lost Sea adventure features a guided tour of the historic Craighead Caverns culminating with a boat ride on America’s largest underground lake. The tour is a three-quarter mile …

Nov 5, 2025 · At the foot of the Great Smoky Mountains between Sweetwater and Madisonville in Tennesee, The Lost Sea is located within the vast cave system, Craighead Caverns.

Located deep inside a historic cave, this hidden gem offers guided tours featuring stunning rock formations, fascinating history, and a boat ride across the crystal-clear waters of the Lost Sea.

Dec 11, 2025 · What’s Inside: Everything you need to know before visiting the Lost Sea Adventure, from what the tour is really like to the can’t-miss underground lake experience in Tennessee.

In times past deep inside a mountain near Sweetwater in East Tennessee is a remarkable body of water known as The Lost Sea. Listed by the Guinness Book of World Records as America’s largest …