Eroded rocks of the Bardenas Reales, a 42,000 hectare area of semi-desert and badlands, forming a UNESCO Biosphere Reserve, the Bardenas Reales Nature Reserve, in Navarre, Spain. The desert area is in the Ebro valley at the foot of the Yugo mountains and the Zaragoza region of Cinco Villas. Clay, chalk and sandstone terrain has been eroded by water and wind creating canyons, plateaus, tabular structures and isolated hills, called cabezos. Picture by Manuel Cohen
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