the bardenas reales desert and nature reserve in northern spain at sunset

arid bardenas barranco beauty biosphere cabezo canyon canyonlands castidetierra castildetierra cliffs colorful cortinas desert dry dusk erosion europe european evening golden grasses grasslands hill landscape las light mamelon maountain mesa monumento mountain nature navarra reales reserve sand sandstone savannah scenery segador shrubs spain steppe structure sunset table twilight