National Natural Landmarks

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 ; Santa Cruz County, AZ

Year designated: 1974

Acres: 50

Ownership: Federal

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Please remember, National Natural Landmarks (NNLs) are not national parks. NNLs are owned by a variety of public and private entities and allowing visitation is at their discretion. Many NNL sites maintain public websites where additional information may be found.


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