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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.

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Pages in category "Subterranea (geography)"

The following 78 pages are in this category, out of 78 total. This list may not reflect recent changes.

 

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