This enormous gash in the rock is uniquely beautiful, forged as it is by a gorge. You can cross it by a primitive stone bridge that only has one arch, consequence of the erosive action of the Asabón river. You can get there from Villalangua, crossing the river and taking a sign-boarded track. A seven-metre water-fall greets you after walking for about 15 minutes. You should see numerous eagles on the way. Close to the gully you can observe the Osqueta Pass in the shape of a W.

These stone monoliths rise majestically close to the town of Agüero and they give the place its identity.

These ridges are formed by conglomerates that originated in the accumulation of solid particles from the destruction of some of the Pyrenees peaks; the Gállego river deposited these at the foot of the mountain, thus forming a large refuse cone. The way they look today is because of erosion. Their shape and height make them an ideal place for climbing and other sports, as well as for the observation of bird colonies nesting in these surroundings.

Amongst these formations, the Sola Crag monolith, created by the fracture of a large mass of rock, rises to 200 metres on its west slope. If you wish to climb the Sola Crag there are several ways. The ridges are not too high, but they are perhaps not sufficiently close together for this sport.

The views over the synclines and the town houses are impressive and unique. They can be seen from several places in the territory. Some of them, such as sundown from Murillo, or the more extensive view from the Eagle Look-out, afford a beautiful scene.

These vertical walls, rising to 300 metres in height, close to the village and the Gállego river, are limestone conglomerates formed in the Tertiary era. Later on they were eroded by water, rain and wind to form the walls you can see today; these are reddish in colour because of the iron minerals and clay they contain and are quite spectacular at sundown. The Riglos Synclines include the following crags: the Puro, Pisón, Visera and Firé.

Riglos and its ridged cliff formations are a paradise for climbers. They are internationally famous amongst climbing enthusiasts. They are also a paradise for birds of prey who nest and breed in the many hollows in the ridges. These birds, mainly protected birds of prey, can be seen flying over the territory.

To complete your visit, go to the Bird of Prey Interpretation Centre in Riglos, ARCAZ, where you will find ample information on the Griffon vulture.