Onyx Cave
Onyx Cave bezeichnet mehrere Höhlen in den Vereinigten Staaten:
- Onyx Cave (Arizona), National Natural Landmark
- Onyx Cave (Arkansas), älteste besichtigbare Höhle in Arkansas
- Onyx Cave (Missouri), im NRHP gelistet
- Great Onyx Cave, im Mammoth-Cave-Nationalpark, Kentucky
- Great Onyx Cave Entrance, im NRHP gelistet
- Crystal Onyx Cave, Kentucky
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