Wind Cave National Park
National park, southwestern South Dakota, U.S. Established in 1903 to preserve limestone caverns and unspoiled prairie grassland in the Black Hills, it covers an area of 28,292 ac (11,449 ha). Its caves contain 83 mi (134 km) of explored passages and have beautiful rock formations called boxwork, formed by calcite deposition in unique patterns. The park is also a wildlife refuge.
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