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Subterranea (geography)
Subterranea
are
underground
structures
, both natural and man-made. 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
Man-made
/ man-related
Borehole
Bunker
Burial vault
Casemate
Catacombs
Cave dweller
,
Underground living
Cave
temple
Cellar
Dungeon
Dugout
Fogou
Mine
Rock cut architecture
,
rock-cut tomb
Smuggling tunnel
Tunnels
Underground city
,
umbrella
article
for underground dwellings and
facilities
Underground rapid transit system
Wine cave