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| Bardenas Reales | |
|---|---|
 A view of the desert. | |
| Area | 420 km2 (160 sq mi) |
| Naming | |
| Native name | Bárdenas Reales (Spanish) |
| Geography | |
| Country | Spain |
| Autonomous Community | Navarre |
 | |
TheBardenas Reales (sometimes referred asBárdenas Reales in Spanish; in Basque:Errege Bardeak) is asemi-desertnatural region, orbadlands, of some 42,000 hectares (420 km2; 104,000 acres) in southeastNavarre (Spain). The soils are made up ofclay,chalk, andsandstone and have been eroded by water and wind creating surprising shapes, canyons, plateaus, tabular structures, andisolated hills, called cabezos. Bardenas Reales 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 Navarre, borderingAragon. It is located in the middle of the depression of theEbro valley at the foot of the mountains of the Yugo and theZaragoza region ofCinco Villas. It is 45 km (28 mi) from north to south and 24 km (15 mi) east-west and at an altitude ranging between 280 and 659 m (919 and 2,162 ft). Its area is 41,845 hectares (418.45 km2; 103,400 acres). There are only sixteen municipalities, of which thirteen are in Navarre and three in the province of Zaragoza. The Navarrese areValtierra,Arguedas,Carcastillo,Santacara,Mélida,Rada,Caparroso,Villafranca,Cadreita,Tudela,Cabanillas,Fustiñana andBuñuel, while the Zaragozan are:Tauste,Ejea de los Caballeros andSádaba.
Las Bardenas is divided into several distinct areas which mainly include two, Black Bardena and White Bardena, but there are other smaller areas of great singularity.
It is the central area and more desert. Its relief is characterized by extensive plains and deep gorges through which rivers flow. This Bardena owes its name to the presence of white salt that extends over the surface due to the abundance ofgypsum in the soil.
The White Bardena divides into two, the White Lower and Upper White. The first is the most depressed and the second extends from Pisquerra and Eguaras to Carcastillo.
Black Bardena is situated in the southeastern part of the territory on the border of theAutonomous Community of Aragon. Formed by plateaus of different altitudes and cut by rivers flowing at the bottom of the cliffs, this part of the Bardenas is covered with vegetation.
There is a central plateau that lies 100 m (330 ft) above the surrounding area where corn is grown. It is formed byTertiary andQuaternary soils that were raised by pressure associated with the creation ofthe Pyrenees and the mountains of Central Spain that caused the collapse of the Ebro basin forming an inland sea enclosed by theCatalan Coastal Range. Sediments laid down were then eroded from theEocene onwards. These formed gravel and sandstone that stayed at the top, fine sand, clay, and limestone occupy the lower slopes. Clay remained in the centre and limestone and gypsum formed at the edges. The gravel, sandstones, and clay were all associated with alluvial deposits. Mixtures of sandstone and clay formed two mountain ranges between the centre and perimeter. The sediments may have been four metres (13 ft) thick. Ten million years ago, the basin opened to theMediterranean Sea and drained, leaving the Ebro, which began water erosion along the southern perimeter, which left the remaining land relatively flat. The folding effect of erosion is caused by alternate soft and hard materials. If the layers are horizons, then the Cabezas became isolated.
42°11′27″N1°28′12″W / 42.19083°N 1.47000°W /42.19083; -1.47000