COVID-19 Travel Info: Learn More

Lost Sea, America's Largest Underground Lake

Explore Sweetwater, TN

The Lost Sea

Take a boat ride on the Lost Sea, a unique natural wonder which is listed as “America’s Largest Underground Lake” in the Guinness Book of World Records. Lost Sea has been designated a Registered Natural Landmark by the U.S. Dept. of Interior.

Read MoreLess

The Lost Sea, America's Largest Underground Lake

Cascades one of our prettiest formations in the cave

Veil Of Tears Formation

Entrance to the cave

The Lost Sea Glassblower has an amazing display of glass.

Enjoy our gem mine and pan for some awesome gemstones

Try one of our off the beaten path Wild Cave Tours.

The Lost Sea

140 Lost Sea Rd.
Sweetwater, TN 37874

Contact

thelostsea@gmail.com

Hours

Hours Vary see website.

For the most up-to-date hours and information, please contact The Lost Sea directly.

Click to Interact

Get Driving Directions

Nearby Attractions

Still exploring? Try these popular ideas in and around Sweetwater.

Places to Stay

Hotels, Inns & Resorts

Rodeway Inn

Get great value on the road in Sweetwater, TN by staying at our pet-friendly Rodeway Inn® hotel

Hotels, Inns & Resorts

Rodeway Inn Sweetwater

Hotels, Inns & Resorts

Hilltop Hotel & Conference Center

See more

Things to Do

Sweetwater Main Street

Sweetwater Main Street

Come visit the Sweetest Street in Tennessee! Sweetwater Main Street.

Sweetwater TN Virtual Tour

Sweetwater Tennessee Virtual Tour

Take Our Virtual Tour!

Proud members of Farmer Veteran Coalition

Farms & Orchards

WEE

Small family farm with a USDA certified kitchen, sawmill and woodshop, two boys, a grandma, and our dog Tater.

See more

Related Articles

For more info on The Lost Sea or things to do in the area, check out these articles.

Aerial view of Leiper's Fork in Franklin

Tennessee's Hidden Gems In & Out of Big Cities

Willow, the keeper of the forest, at Anakeesta in Gatlinburg

12 whimsical places to visit in Tennessee

Boating on Norris Lake in Tennessee

Your Guide to Water Activities in Tennessee

Foster Falls at South Cumberland State Park in Marion, TN

9 Tennessee Adventures Before Heading Back to School

A person in a canoe at Meeman Shelby State Park in Memphis

Go Outdoors in Tennessee

Cool off in Tennessee

Caves, Lakes, Rivers and Waterfalls: Cool off in Tennessee

Great Smoky Mountains hiking in Tennessee

Tennessee Outdoor Adventures Guaranteed to Get Your Blood Pumping

Christmas at The Island in Pigeon Forge TN

Choose Your Own East Tennessee Winter Vacation

Chilhowee Overlook, Southeast Tennessee

Five East Tennessee Fall Foliage Photo-Ops