Ключевые слова: argumentas, arid, aridity, badlands, bardenas, bardenas real, bars, biosphere, castil de tierra, clay, cliff, cone, country, desert, dry, eroded, erosion, europe, famous, formation, geological, geology, hill, landmark, landscape, mountain, national, natural, natural park, nature, navarra, navarre, outdoor, park, peak, range, real, reserve, ridge, sand, sandstone, scenic, skirt, sky, spain, spanish, tourism, travel, tudela, unesco,