Category:Subterranea (geography)

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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.

Subcategories

This category has the following 34 subcategories, out of 34 total.

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