The Bardenas Reales is a semi-desert natural region, or badlands, of some 42,000 hectares in southeast Navarre . 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 cabezos. Bardenas 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 Bardenas is in the southeast of Navarra, bordering Aragon. It is located in the middle of the depression of the Ebro valley at the foot of the mountains of the Yugo and the Zaragoza region of Cinco Villas. It is 45 km from north to south and 24 km east-west and at an altitude ranging between 280 and 659 m . Its area is 41,845 hectares . There are only sixteen municipalities, of which thirteen are in Navarre and three in the province of Zaragoza. The Navarrese are Valtierra, Arguedas, Carcastillo, Santacara, Mélida, Rada, Caparroso, Villafranca, Cadreita, Tudela, Cabanillas, Fustiñana and Buñuel, while the Zaragozan are: Tauste, Ejea de los Caballeros and Sádaba.
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