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Onyx Cave

Onyx Cave is a solutional cave system with about 0.5 miles (0.8 km) of passages formed in Permian limestone in the Santa Rita Mountains of Arizona. It is part of the Coronado National Forest. It was designated a National Natural Landmark in 1974.

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Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).

More caves in United States

  1. Lechuguilla Cave489 m deep
  2. Carlsbad Caverns National Park333 m deep
  3. Natural Tunnel State Park0.3 km
  4. Merrill Cave0.2 km
  5. Layser Cave0 km

Other notable caves worldwide

  1. Mammoth Cave · Australia686 km
  2. Sistema Sac Actun · Mexico119.2 m
  3. Lechuguilla Cave · United States489 m
  4. Optymistychna Cave · Ukraine20 m
  5. Veryovkina Cave · Georgia2,212 m
  6. Krubera Cave · Georgia2,199 m
  7. Sarma cave · Georgia1,830 m
  8. Clearwater Cave · Malaysia109 km