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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] Some caves and cave systems are partially accessible to the general public.
Carlsbad Cavern includes a large limestone chamber, named simply the Big Room, which is almost 4,000 ft (1,220 m) long, 625 ft (191 m) wide, and 255 ft (78 m) high at its highest point. The Big Room is the largest chamber in North America and the 32nd largest in the world. [4]
This is a list of natural caves in the United States. Alabama. Cathedral Caverns; Crystal Cavern; DeSoto Caverns; Dust Cave; Fern Cave; Manitou Cave; Rickwood Caverns;
Mammoth Cave National Park is a national park of the United States in south-central Kentucky. It encompasses portions of Mammoth Cave, the longest known cave system in the world. The park's 52,830 acres (21,380 ha) are located primarily in Edmonson County, with small areas extending eastward into Hart and Barren counties.
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.
Craighead Caverns is an extensive cave system located in between Sweetwater and Madisonville, Tennessee. It is best known for containing the United States ' largest and the world's second largest non- subglacial underground lake, The Lost Sea .
At 150.4 miles (242.0 km), Lechuguilla Cave is the eighth-longest explored cave in the world [1] and the second deepest (1,604 feet or 489 meters) in the continental United States. [2] It is most famous for its unusual geology , rare formations , and pristine condition.
Natural Bridge Caverns. The Natural Bridge Caverns are the largest commercial caverns in the US state of Texas. The name [1] is derived from the 60-foot (18 m) natural limestone slab bridge that spans the amphitheater setting of the cavern's entrance. The span was left suspended when a sinkhole collapsed below it.