Subterranea are underground structures, both natural (such as caves) and human-made (such as mines). Some subterranea and related topics include: == Natural == Caves Cenote Ice cave Sea cave Sinkhole Karst Lava tube Lunar and Martian lava tubes Subterranean river Subterranean waterfall Underground lake Volcanic pipe == Human-made or human-related by common function == The following is a list of examples of structures which are or can be underground.
Subterranea are underground structures, both natural (such as caves) and human-made (such as mines). Some subterranea and related topics include: == Natural == Caves Cenote Ice cave Sea cave Sinkhole Karst Lava tube Lunar and Martian lava tubes Subterranean river Subterranean waterfall Underground lake Volcanic pipe == Human-made or human-related by common function == The following is a list of examples of structures which are or can be underground.
Source: Wikipedia "Subterranea (geography)" · CC BY-SA 4.0
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