Lably
Skip to content

Wind Cave National Park

National park in South Dakota, United States

  • 8 min read
  • 8 chapters
Skyway Lake, stalactites, Wind Cave
National Park Service of the United States of America · Public domain

Related on Lably

Through Cave, Atmospheric pressure and Sacredness

Wind Cave is one of the best known examples of a breathing cave. The cave is recognized as the densest cave system in the world, with the greatest passage volume per cubic mile. Wind Cave is the sixth longest cave in the world with 168.02 miles (270.40 km) of explored cave passageways (as of 2025) and the third longest cave in the United States, though it is only the second longest cave in Custer County, South Dakota behind Jewel Cave. Despite the close proximity, no connection has ever been found between Wind Cave and Jewel Cave and most geologists believe the caves are not connected. Above ground, the park includes the largest remaining natural mixed grass prairie in the United States, as well as the southern terminus of the South Dakota Centennial Trail.

Origin of name

The passages of the cave are said to "breathe" as air continually moves into or out of them, equalizing the atmospheric pressure of the cave and the outside air. When the air pressure is higher outside the cave than inside it, air flows into the cave, raising the cave's pressure to match the outside pressure. When the air pressure inside the cave is higher than outside it, air flows out of the cave, lowering the air pressure within the cave. A large cave such as Wind Cave with only a few small openings will "breathe" more obviously than a small cave with many large openings.

Rapid weather changes, accompanied by rapid barometric changes, are a feature of western South Dakota weather. If a fast-moving storm was approaching on the day the Bingham brothers found the cave, the atmospheric pressure would have been dropping fast, causing the cave's higher-pressure air to rush out all available openings, creating the wind for which Wind Cave was named.

Sign in to keep reading

7 more chapters are free with a Lably account.

More in Physical