List of longest caves
System Length Location Discovery Associated parks , protected areas
Mammoth Cave 667.8 km ( 415.0 mi ) near Brownsville , Kentucky , United States 1791 Mammoth Cave National Park , also a World Heritage Site and International Biosphere Reserve
Sistema Sac Actun / Sistema Dos Ojos 371.9 km ( 231.1 mi ) near Tulum , Quintana Roo , Mexico 1987 none
Jewel Cave 334.8 km ( 208.0 mi ) near Custer , South Dakota , United States 1900 Jewel Cave National Monument
Sistema Ox Bel Ha 271.0 km ( 168.4 mi ) near Tulum , Quintana Roo , Mexico 1996 southern parts in Sian Ka'an Biosphere Reserve
Shuanghedong Cave Network 257.4 km ( 159.9 mi ) Guizhou , China 1988 Suiyang Shuanghedong National Geopark
Optymistychna Cave 257.0 km ( 159.7 mi ) near Korolivka , Ukraine 1966 Dnistrovskyy Canion
Wind Cave 245.1 km ( 152.3 mi ) near Hot Springs , South Dakota , United States 1881 Wind Cave National Park
Lechuguilla Cave 241.4 km ( 150.0 mi ) near Carlsbad , New Mexico , United States 1900 Carlsbad Caverns National Park
Clearwater Cave System 227.0 km ( 141.1 mi ) near Miri , Sarawak , Malaysia 1978 Gunung Mulu National Park , also a World Heritage Site
Fisher Ridge Cave System 209.2 km ( 130.0 mi ) near Brownsville , Kentucky , United States 1981 partly within Mammoth Cave National Park
Hölloch 201.9 km ( 125.5 mi ) Muotathal , Switzerland 1875 none
List
This List of longest caves includes caves in which the combined length of documented passageways exceeds 200 km. In some of these caves, passageways are still being discovered.