Bardenas Reales (Aragonese Side) Nature · Ejea de los Caballeros, Cinco Villas, Zaragoza Image of Ejea de los Caballeros, not of the place itself. The Aragonese side of the Bárdenas Reales, known as the Aragonese Bardena, is the geographical continuation of the Navarrese Bárdenas within the Cinco Villas, divided among the territories of Ejea de los Caballeros, Sádaba and Tauste; it occupies about 10,000 hectares within the so-called Bardena Negra and reaches its highest point at the Alto de la Negra, at 648 metres. This semi-desert territory, declared a Biosphere Reserve by UNESCO in the year 2000, is also protected as a Special Protection Area for Birds (SPA) and a Site of Community Importance (SCI); its landscape of ravines, flatlands and isolated hillocks was formed by erosion over a cold steppe climate, with rainfall of between 300 and 450 mm annually. Photo: Zarateman (CC0) What to see and do in Ejea de los Caballeros