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Subterranea (geography)

Topic: Category

 From Wikipedia - Reading time: 1 min
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The main article for this category is Subterranea (geography).
This category is for Subterranea refers to underground structures, both natural (such as caves) and man-made (such as mines). Some subterranean features are secret places (see also Category:Secret places); most, like road tunnels, subway systems and sewers, are parts of public infrastructure.
Licensed under CC BY-SA 3.0 | Source: https://en.wikipedia.org/wiki/Category:Subterranea_(geography)
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