natural hole
- caveUnderground hollow in rock
- cavernLarge natural underground chamber
- burrowAnimal's dug dwelling
- denPrivate room or lair
- hollowEmpty within
crater · crevice · opening · gorge · abyss · chasm · grotto · sinkhole · warren · lair · depression · cavity · fissure · void · underground · dark · deep · rabbit
origin/formation
natural holetunnel
Enclosed underground route
mine shaft · quarry · well · pit · manhole
presence/absence of void
natural holenatural formation
Landscape element from nature
solid rock · outcrop · boulder · hill · ridge