acclivity
ascent
bluff
butte
cliff
cliffs
cliffs of moher
coast
coastline
drift
dune
elevation
erosion
esker
headland
heap
high cliffs
highland
hilltop
hummock
inclination
incline
ireland
irish
irish cliffs
knoll
mesa
moher
mound
mount
ocean
precipice
prominence
promontory
ridge
rise
sea
sea erosion
sea stack
slope
stack
summit