Subterranea (geography)
Subterranea are underground structures, both natural (such as caves) and man-made (such as mines). Some subterranea and related topics include:
See also
Man-made and man-related Subterranea | |
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| Natural features | |
| Civilian features |
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| Military features | |
| Mining, quarrying, and underground construction | |
| Related topics |
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