Jewel Cave National Monument

5.00 out of 5


Jewel Cave, located in Jewel Cave National Monument, is officially the second-longest mapped cave in the world (behind Mammoth Caverns in Kentucky) with a length of 157 miles. Because of the length, it takes explorers a significant amount of time to reach the unexplored portions of the cavern, oftentimes requiring camping underground on expeditions of 4 or more days in length. According to Wikipedia, "The discovered areas in the cave account for only about 2% of the estimated total air volume of the cave. The cave volume is estimated by measuring the amount of air that the cave "exhales" when the outside air pressure drops and "inhales" when the outside air pressure rises."

Jewel Cave contains all of the traditional speleothems, although not in as high of quantities as some other well-known caverns. Some of the unique formations include a hydromagnesite balloon, which is formed by a gas inflating this substance.

The cave is open for tours all year long. There are 3 different tours offered, varying in difficult from very easy, short tours to spelunking tours through undeveloped caverns.
  • Add to 'My Caves'
  • Add to 'Spelunking Wishlist'
  • Posted by Greg Heil on March 23, 2012


    Questions   [ask a question]

    Note: You're not logged in. If you'd like to associate this post with your account, login now.
    Ask a question
    Notify me when anyone replies
    Be the first to review this cave and earn free Tripleblaze stickers!

    Reviews of Jewel Cave National Monument

    No reviews yet. Add your hiking trail review!

    Cave Recommendations

    Wind Cave National Park (100%)
    Blanchard Springs Caverns (50%)
    Mammoth Cave (50%)
    Lava River Cave (50%)
    Jewel Cave National Monument 5.00 out of 5 based on 0 ratings. 0 user reviews.

    South Dakota Outdoor Lists

    South Dakota Camping
    South Dakota Trail Running
    South Dakota Hiking Trails
    South Dakota Skiing
    South Dakota Mountain Bike Trails
    South Dakota Caves