mountain castildetierra in bardenas reales nature park, navarra, spain

arid aridity badlands bardenas 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 mountain nature navarra navarre park plateau ravine reales relief ridge rough rugged salt sandstone sediment semi shape spain steppe tabular