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Caves are found around the world. The largest form in areas of karst landforms whose rocks dissolve easily. Preferable conditions for karst cave formation are adequate precipitation, enough plants and animals to produce ample carbon dioxide, and a landscape of gentle hills which drains slowly.
This list of longest caves by country includes the longest-known natural cave per country. To be listed, the caves must have been surveyed to cave surveying standards , and the results published in reliable sources.
Mammoth Cave, the longest known cave system in the world The following is a list of the longest caves in the United States per length (over 50 kilometres or 30 miles) of documented passageways. Many passageways are still being discovered; this list is based on the latest verifiable data. [ 1 ]
Fitton Cave, also known as Beauty Cave, [1] is located near the Buffalo National River in Arkansas. According to Robert Gulden 's cave database, it contains 17.5 miles of mapped passage as of 2024, and is the longest known cave in Arkansas, and the 188th longest in the world.
Tourists inside the cave. The park's mission is stated in its foundation document: [7] The purpose of Mammoth Cave National Park is to preserve, protect, interpret, and study the internationally recognized biological and geologic features and processes associated with the longest known cave system in the world, the park’s diverse forested karst landscape, the Green and Nolin rivers, and ...
Newly mapped and explored passages make Kentucky's Mammoth Cave even longer. Its known length now stands at 420 miles.
The longest surveyed underwater cave, and second longest overall, is Sistema Ox Bel Ha in Yucatán, Mexico at 436 km (271 mi). [16] The deepest known cave—measured from its highest entrance to its lowest point—is Veryovkina Cave in Abkhazia, Georgia, with a depth of 2,204 m (7,231 ft). [17]
For many years it was considered the longest cave in the world. As of 11 March 2022, the Organ Cave System had 38.452 miles (61.882 km) of surveyed cave passage making it the 55th longest cave in the world, the 16th longest in the United States, and the 3rd longest in West Virginia. [4]