bardenas reales natural park, an extensive desert region, with imposing canyons, limestone cliffs and rocky outcrops

attraction badlands bardenas barren biosphere blue canyons chalk cliffs cloudy daytime desert drought dry eroded erosion europe extensive formation geologic geological geology hill imposing journey landmark landscape limestone located natural nature navarra navarre outcrops outdoor park province pyramid reales region reserve rock rocky sand sandstone semidesert shape sky solitary spain spanish stone territory touristic travel undefined unique water wind