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Longest Caves in the World

The definition of a cave is a natural underground space large enough for a person to enter. Caves are formed through various geological processes, with the longest ones typically found in areas with karst landforms, where soluble rocks like limestone dissolve over time [1] [2].

Mammoth Cave System, USA: The Mammoth Cave system in Kentucky is consistently recognized as the longest cave system in the world. As of September 2022, it has been mapped and explored to a length of 426 miles (686 km) [3] [4]. The cave's history spans thousands of years, with evidence of Native American exploration dating back 5,000 years [3]. The cave continues to be explored, and its exact length is still unknown [3].

Sistema Ox Bel Ha, Mexico: The Sistema Ox Bel Ha, located near Tulum in Mexico's Quintana Roo state, is the second-longest cave system, with a surveyed length of 270.8 miles of underwater passages [5]. It is the world’s longest explored underwater cave system [5].

Shuanghedong Cave Network, China: The Shuanghedong Cave Network in China's Guizhou province is the third-longest cave, with a total length of approximately 249.0 miles [6]. It is the longest cave in Asia [6].

Sistema Sac Actun/Sistema Dos Ojos, Mexico: The Sistema Sac Actun, located in the Yucatan Peninsula of Mexico, is the fourth-longest cave system, with a total length of 239.9 miles [7]. The connection with the adjacent Sistema Dos Ojos underwater cave complex in 2018 made it the world’s second-longest underwater cave system [7].

Jewel Cave, USA: Jewel Cave in South Dakota is the fifth-longest cave, with 217.32 miles of mapped passageways [8].

Optymistychna Cave, Ukraine: Optymistychna Cave, with a total of 164.4 miles of mapped passageways, is the sixth-longest cave in the world and the longest gypsum cave [9].

Wind Cave, USA: Wind Cave in South Dakota is the seventh-longest cave, with 161.7 miles of explored passageways [10].

Clearwater Cave System, Malaysia: The Clearwater Cave System in Gunung Mulu National Park, Malaysia, is the eighth-longest cave, with a total length of 159.0 miles [11].

Lechuguilla Cave, USA: Lechuguilla Cave in Carlsbad Caverns National Park, New Mexico, is the ninth-longest cave, with 150.4 miles of explored passages [12].

Fisher Ridge Cave System, USA: The Fisher Ridge Cave System in Kentucky is the tenth-longest cave, with 131.8 miles of explored passages [13].

Son Doong Cave, Vietnam: While not the longest, Son Doong Cave in Vietnam is the world's largest by volume. It is estimated to be over 5.5 miles in length, with caverns large enough to hold a 40-story skyscraper [14] [15].

Miao Room, China: The Miao Room cavern, located within the Gebihe cave system in China, is the largest known cave chamber in the world by volume [16].

Sac Actun, Mexico: Sac Actun is the largest underwater cave system [7].

1. List of longest caves. [Wikipedia]↩
2. The Longest Caves in the World. [WorldAtlas]↩
3. Exploring the World's Longest Known Cave. [NPS]↩
4. From the Biggest to the Longest, Five Amazing Caves To Visit. [Smithsonian Magazine]↩
5. The Longest Caves in the World. [WorldAtlas]↩
6. The Longest Caves in the World. [WorldAtlas]↩
7. The Longest Caves in the World. [WorldAtlas]↩
8. The Longest Caves in the World. [WorldAtlas]↩
9. The Longest Caves in the World. [WorldAtlas]↩
10. The Longest Caves in the World. [WorldAtlas]↩
11. The Longest Caves in the World. [WorldAtlas]↩
12. The Longest Caves in the World. [WorldAtlas]↩
13. The Longest Caves in the World. [WorldAtlas]↩
14. From the Biggest to the Longest, Five Amazing Caves

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