arid
bardenas
barren
biosphere
castildetierra
chalk
clay
cliff
climate
crag
day
desert
drought
dry
dryland
eroded
europe
european
fields
geology
heat
hill
land
landscape
limestone
marl
mineral
mountain
nature
navarra
park
ravine
reales
reserve
ridge
rock
rough
sand
sandstone
sky
spain
spanish
summer
temperature
valley