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Lost Sea, America's Largest Underground Lake

Explore Sweetwater, TN

The Lost Sea

Cool off in Tennessee
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Go Outdoors in Tennessee

Learn more about The Lost Sea.

Visit our site

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.

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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

Questions? Please Email
thelostsea@gmail.com
Contact Phone Number
423-337-6616
Fax Number
423-337-0803
Visit Our Site Buy Tickets
Admission Rates
Adults $21.95 Children (4-12) $12.95 children 3 and under free
Dates Closed
Closed Thanksgiving Day
Closed Christmas Day
Hours
Hours Vary see website.
Discounts Offered
  • Senior Citizen Discount
  • Group Discount
  • Military Discount
  • AAA Discount
Payment Methods Accepted
  • Cash
  • Discover
  • Mastercard
  • Visa
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Get Driving Directions

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

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Hotels, Inns & Resorts

Rodeway Inn Sweetwater

Hotels, Inns & Resorts

Hilltop Hotel & Conference Center

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Things to Do

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.

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Sweetwater TN Virtual Tour
Shopping

Sweetwater Tennessee Virtual Tour

Take Our Virtual Tour!

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Arts & Entertainment

Historic Sweetwater

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Ready for a Made In TN Road Trip?

Tanasi Trail

Explore early Native American footpaths, the passages of the early westbound settlers, the railroads that changed life and commerce forever, and today’s protected scenic byways and gorgeous overlooks.

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Tanasi Trail sign graphic.