U.S. Cave Facts

On the Road, Travel Destinations
on May 16, 2011
Courtesy of National Park Service

More than 20,000 caves dot the United States, according to the National Speleological Society, which also offers up these underground superlatives:

  • Total number of miles mapped: Nearly 5,000
  • Longest Cave: Mammoth Cave, Mammoth Cave, Ky., 390 miles
  • Deepest Limestone Cave: Lechuguilla Cave, Eddy County, N.M., 1,604 feet
  • Largest underground chamber: Carlsbad Caverns’ Big Room, Carlsbad Caverns, N.M., 33,210 square  meters
  • Longest sea cave: Painted Cave, Santa Cruz Island, Calif., 1,227 feet
  • Longest underwater cave: Wakulla-Leon Sinks Cave System, Leon and Wakulla counties, Fla., 32 miles
  • Longest Gypsum Cave: D.C. Jester Cave System, Greer County, Okla., 6 miles