Mount Carmel/Duplex

Historical marker location:

2300 Lewisburg Pike, Franklin, Tennessee

( Marker is on Lewisburg Pike (U.S. 431) north of Bethesda-Duplex Road, on the right when traveling south.)

Marker installed: 1998

The largest underground lake in the United States is located in Tennessee. The Lost Sea, located in Sweetwater, Tennessee, covers over four acres and is home to a variety of unusual creatures, including blind fish and crayfish.