abysm
abyss
arroyo
box canyon
breach
break
cavity
chap
chasm
check
chimney
chink
cleft
cleuch
clough
col
coulee
couloir
crack
cranny
crevasse
crevice
cut
cwm
dale
dalles
defile
dell
dike
ditch
donga
draw
excavation
fault
fissure
flaw
flume
fracture
furrow
gap
gape
gash
gill
gorge
groove
gulch
gulf
gully
hole
cañon
ravine
Copper Canyon
Grand Canyon
concrete canyon
bluff
cavern
cliff
crater
creek
dune
glacier
glen
ledge
passageway
peak
plateau
precipice
stairway
swamp
valley
waterfall
banyan
companion