Find Your Park logo
Read about the Newest National Natural Landmark
NNL 50th Anniversary

For the more information about the air resources of the National Park Service, please visit

Onyx Cave

Onyx Cave
Onyx Cave

Onyx cave, located within Coronado National Forest, is considered to be the finest cave in Arizona. Helictites and speleothems, such as shields are numerous and beautifully developed.

Location: Santa Cruz County, AZ

Year designated: 1974

Acres: 50

Ownership: Federal

← Back to NNL listing for AZ.

← Back to listing of all states and territories.

Please remember, National Natural Landmarks (NNLs) are not national parks. NNL status does not indicate public ownership, and many sites are not open for visitation.

Last Updated: June 28, 2012