arid
aridity
badlands
bardenas
bardenas reales
barren
castildetierra
chalk
clay
cliff
crack
desert
dry
dryland
erosion
famous
formation
geology
gorge
gypsum
hill
land
landmark
landscape
limestone
loam
mountain
nature
navarra
navarre
park
peak
plateau
reales
ridge
rock
rugged
salt
sand
sandstone
sediment
shape
sightseeing
slope
spain
steppe
texture
wilderness