2.7 miles away
Kentucky Camp
A ghost town and former mining camp near Sonoita, listed on the National Register of Historic Places since 1995 and maintained by the US Forest Service.
Onyx Cave
A half-mile solutional cave in Permian limestone in the Santa Rita Mountains, designated a National Natural Landmark in 1974.
- Rank in Arizona
- #427of 727 ranked
- Overall score
- Score 36.0 out of 100medium confidence
- Category
- Natural Landmark
Onyx Cave is a solutional cave system with about half a mile of passages, formed in Permian limestone in the Santa Rita Mountains of Arizona. It lies within the Coronado National Forest and was designated a National Natural Landmark in 1974.
Where it is
Onyx Cave is a natural landmark near Sonoita, in Santa Cruz County. It is one of the natural landmarks in this database, and appears in the statewide ranking of Arizona attractions.
How this ranking was reached
No official visitor count is published for Onyx Cave, so its score rests on public interest and tourism significance, and is capped below the level a measured attraction can reach. That is why the medium confidence above is not higher. The weighting is explained in full on the methodology page, and every axis is broken out under Facts and sources at the foot of this page.
Note on the data: No official visitor count is published for this attraction.
Sources
- Public interest: Wikimedia pageviews (en.wikipedia, human traffic), 2024
- Coordinates and designations: Wikidata(opens in a new tab)
- County: U.S. Census geography via FCC Area API, resolved from coordinates
Record last verified 2026-08-12.
Nearby attractions
4.9 miles away
Mount Wrightson
A 9,456-foot peak in the Santa Rita Mountains within the Coronado National Forest, named for the miner William Wrightson.
5.5 miles away
Fort Buchanan
An 1856 US Army post south-west of Sonoita, burned by Apaches in 1865 and abandoned; its ruins were rediscovered in 1929.
6.6 miles away
Santa Rita Mountains
A Madrean sky island range south-east of Tucson, rising to 9,453 feet at Mount Wrightson and containing Madera Canyon.
8.8 miles away
Empire Ranch
A working cattle ranch in south-eastern Pima County, listed in 1976, whose range once spanned more than 180 square miles.
9.8 miles away
Helvetia
A ghost town in Pima County settled in 1891 and abandoned in the early 1920s, most of it now fenced off by active mining.
Facts and sources
Place
- Category
- Natural Landmark
- Destination
- Sonoita
- County
- Santa Cruz County
- State
- Arizona
- Designations
- National Natural Landmark
Visitation
- Annual visits
- Not published
Ranking
- Overall score
- 36.0 / 100
- Visitation score
- No published count
- Popularity score
- 0.0
- Significance score
- 66.0
- Confidence
- medium
Visiting
- Coordinates
- 31.7175, -110.7690
- Last verified
- 2026-08-12