- Source: Subterranea (geography)
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 related
Borehole
Bunker
Burial vault (tomb)
Casemate
Catacombs
Cave dweller, Underground living
Cave temple
Cellar
Dungeon
Dugout (shelter)
Fogou
Hypogeum
Mine
Rock cut architecture, rock-cut tomb
Smuggling tunnel
Tunnels (street tunnel, train tunnels)
Underground city, umbrella article for underground dwellings and facilities
Underground rapid transit system
Wine cave
See also
Boring (earth)
Seattle Underground
Subterranean London