arid
aridity
badlands
bardenas
bardenas reales
barren
castildetierra
chalk
clay
cliff
craggy
crest
desert
dry
dryland
eroded
erosion
geology
geomorphology
gorge
ground
gully
gypsum
hill
land
landscape
limestone
loam
marl
mesa
nature
navarra
navarre
plateau
ravine
reales
relief
ridge
rough
rugged
salt
sandstone
sediment
semidesert
shape
spain
steppe
tabular