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Carlsbad Cavern National Park contains 113 caves, formed when sulfuric acid dissolved the surrounding limestone, creating some of the largest caves in North America.
The largest of them, the Big Room, covers 8.2 acres - an area larger than six football fields. It is located 900 ft below the surface, is 250 feet wide, 1,800 feet long and up to 255 feet high which makes it the larges cave in North America.
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