#
System
Length
Location
coordinates
Discovery
Associated parks, protected areas
1
Mammoth Cave
685.6 km (426.0 mi)[ 3] [ 4]
near Brownsville, Kentucky , United States
37°11′15″N 86°06′13″W / 37.18758°N 86.10357°W / 37.18758; -86.10357 (Mammoth cave historic entrance )
1791
Mammoth Cave National Park , also a World Heritage Site , International Biosphere Reserve , and International Dark Sky Park
2
Sistema Ox Bel Ha
496.8 km (308.7 mi)[ 5] [ 6]
near Tulum, Quintana Roo , Mexico
20°09′37″N 87°29′15″W / 20.16028°N 87.48750°W / 20.16028; -87.48750 (Sistema Ox Bel Ha )
1996
southern parts in Sian Ka'an Biosphere Reserve
3
Shuanghedong Cave Network
417.6 km (259.5 mi)[ 7] [ 8]
Guizhou , China
28°14′31″N 107°16′34″E / 28.24199°N 107.27608°E / 28.24199; 107.27608 (Shuanghe Dongqun )
1988
Suiyang Shuanghedong National Geopark
4
Sistema Sac Actun / Sistema Dos Ojos
386.1 km (239.9 mi)
near Tulum, Quintana Roo , Mexico
20°14′48″N 87°27′51″W / 20.246556°N 87.464111°W / 20.246556; -87.464111 (Gran Cenote )
1987
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5
Jewel Cave
354.07 km (220.0 mi)[ 9] [ 10]
near Custer, South Dakota , United States
43°43′46″N 103°49′46″W / 43.72944°N 103.82944°W / 43.72944; -103.82944 (Jewel Cave )
1900
Jewel Cave National Monument
6
Wind Cave
266.8 km (165.8 mi)[ 11]
near Hot Springs, South Dakota , United States
43°33′29″N 103°28′46″W / 43.55804°N 103.47955°W / 43.55804; -103.47955 (Wind Cave )
1881
Wind Cave National Park
7
Optymistychna Cave
264.5 km (164.4 mi)[ 12]
near Korolivka , Ukraine
48°44′20″N 25°59′22″E / 48.738830378°N 25.989496042°E / 48.738830378; 25.989496042 (Grotte Optimiste )
1966
Dnistrovskyy Canion
8
Clearwater Cave System
257.8 km (160.2 mi)[ 13] [ 14]
near Miri , Sarawak , Malaysia
4°03′55″N 114°49′54″E / 4.06529°N 114.83176°E / 4.06529; 114.83176 (Clearwater Cave )
1978
Gunung Mulu National Park , also a World Heritage Site
9
Lechuguilla Cave
244.7 km (152.0 mi)[ 15] [ 16]
near Carlsbad, New Mexico , United States
32°11′26″N 104°30′12″W / 32.1906420°N 104.5033091°W / 32.1906420; -104.5033091 (Grotte de Lechuguilla )
1900
Carlsbad Caverns National Park
10
Fisher Ridge Cave System
212.1 km (131.8 mi)
near Brownsville, Kentucky , United States
37°11′30″N 85°58′48″W / 37.191736°N 85.980122°W / 37.191736; -85.980122
1981
partly within Mammoth Cave National Park
11
Hölloch
211.2 km (131.2 mi)[ 17] [ 18]
Muotathal , Switzerland
46°58′36″N 8°47′18″E / 46.976670°N 8.788330°E / 46.976670; 8.788330
1875
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12
Sistema del Alto Tejuelo
208.9 km (129.8 mi)[ 19]
Cantabria , Spain
43°15′11″N 3°40′51″W / 43.2530670°N 3.6807990°W / 43.2530670; -3.6807990
1965
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13
Siebenhengste-Hohgant-Höhle
164.5 km (102.2 mi)[ 20] [ 21]
Switzerland
46°47′02″N 7°54′04″E / 46.783822°N 7.901231°E / 46.783822; 7.901231
1966
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14
Schönberg Cave System
156.9 km (97.49 mi)[ 22] [ 23] [ 24]
Austria
47°42′06″N 13°46′20″E / 47.701528°N 13.772333°E / 47.701528; 13.772333
1976
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15
Mortillano system
146.5 km (91.03 mi)[ 25]
Cantabria , Spain
43°13′51″N 3°33′43″W / 43.23082°N 3.56197°W / 43.23082; -3.56197
1960
{{{1}}}
16
Priest's Grotto
142.1 km (88.30 mi)[ 26]
Ukraine
48°45′52″N 25°57′57″E / 48.7644444°N 25.9658330555°E / 48.7644444; 25.9658330555
1940
{{{1}}}
17
Steinbrücken Cave
137.7 km (85.56 mi)[ 23]
Austria
47°39′43″N 13°48′11″E / 47.661940°N 13.803060°E / 47.661940; 13.803060
1929
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18
Marosakabe cave system
124 km (77.05 mi)[ 27] [ 28]
Madagascar
16°27′07″S 45°20′08″E / 16.45189°S 45.33543°E / -16.45189; 45.33543 (Zohy Tsongom'omby )
2006
Tsingy de Namoroka Strict Nature Reserve
19
Bullita Cave
123 km (76.43 mi)[ 29] [ 30]
Australia
16°03′48″S 130°23′00″E / 16.063330°S 130.383330°E / -16.063330; 130.383330
1990
Gregory National Park
20
Sistema del Gandara
119.0 km (73.94 mi)[ 31] [ 32]
Cantabria , Spain
43°11′34″N 3°34′46″W / 43.1927260°N 3.5794850°W / 43.1927260; -3.5794850
2005
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21
Hirlatzhöhle
117.8 km (73.20 mi)[ 22]
Austria
47°32′42″N 13°37′51″E / 47.544975°N 13.630953°E / 47.544975; 13.630953
1949
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22
Réseau Félix Trombe
117.2 km (72.82 mi)[ 33]
France
42°58′21″N 0°51′59″E / 42.972500°N 0.866390°E / 42.972500; 0.866390
1908
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23
Toca da Boa Vista
114 km (70.84 mi)[ 34]
Brazil
10°09′45″S 40°51′35″W / 10.162500°S 40.859722°W / -10.162500; -40.859722 (Toca da Boa Vista )
1987
{{{1}}}
24
Ojo Guareña
111 km (68.97 mi)[ 35] [ 36]
Spain
43°02′02″N 3°37′50″W / 43.03376°N 3.63059°W / 43.03376; -3.63059
1956
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25
Sistema K'oox Baal
103.8 km (64.50 mi)[ 37]
near Tulum, Quintana Roo , Mexico
20°22′21″N 87°25′02″W / 20.372622°N 87.417239°W / 20.372622; -87.417239 (K'oox Baal )
1987
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26
Sistema Purificacion
101.4 km (63.01 mi)[ 38] [ 39]
Mexico
24°04′03.30″N 99°33′54.93″W / 24.0675833°N 99.5652583°W / 24.0675833; -99.5652583 (Sistema Purification )
1970
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27
Sistema Huautla
100.2 km (62.26 mi)[ 40] [ 41]
Mexico
18°07′16.37″N 96°48′00.03″W / 18.1212139°N 96.8000083°W / 18.1212139; -96.8000083 (Sótano de San Agustin, Sistema Huautla )
1965
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