The Bárdenas Reales is a semi-desert natural region, or badlands, of some 42,000 hectares (100,000 acres) in southeast Navarre (Spain). The soils are made up of clay, chalk and sandstone and have been eroded by water and wind creating surprising shapes, canyons, plateaus, tabular structures and isolated hills, called seamounts. Bárdenas lacks urban areas, vegetation is scarce and the many streams that cross the territory have a markedly seasonal flow, staying dry most of the year.
The 'White Bárdena' is the central area and more desert. Its relief is characterized by extensive plains and deep gorges through which rivers flow. This Bárdena owes its name to the presence of white salt that extend over the surface due to the abundance of gypsum in the soil.