Jewel Cave National Monument

Jewel Cave National Monument

National monument, southwestern South Dakota, U.S. Established in 1908, it occupies an area of 2 sq mi (5 sq km). It is noted for its limestone caverns, a series of chambers joined by narrow passages. The known length of the caverns is 77 mi (124 km).

This entry comes from Encyclopædia Britannica Concise.
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