Sierra de Guara is an enchanting area covering 81 225ha (20% of which lies in the Somontano) which in 1990 acquired protected status. Traversed from north to south by numerous ríos running through canyons of grey-orange stone, its turquoise waters ..

The Arabs built an alcázar here, which was taken by King Sanchez I Ramirez at the end of the 11C. The northern gallery of the romanesque cloister has preserved its lovely capitals representing scenes from the Bible: the sacrifice of Isaac, Balaam wit..

It can take at least a day to climb, and sometimes swim, through this spectacular valley. But a simple walk to the Roman bridge of Villacantal is enough to give you a good view of the high ochre and grey walls of the canyon.