Castilltierra, Bardenas reales. Biosphere Reserve, Navarra, Spain

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Photo credit: © Tolo Balaguer / Alamy / Afripics
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Keywords: arid, aridity, basin, color, , ebro, environment, erosion, europe, geology, haughty, head, hydrology, locations, natural, navarra, orography, park, places, protected, pyramid, risco, sandy, seco, sedimentary, sites, space, unpopulated, world