Cliffs of Riglos Nature · Las Peñas de Riglos, Hoya de Huesca, Huesca The Mallos de Riglos are formations of reddish Miocene conglomerate, cemented by carbonates, raised by the alpine orogeny during the folding of the Pyrenees and later shaped by erosion, which has carved deep ravines and chimneys into the rock. They lie next to the town of Riglos, in the Huesca Pre-Pyrenees, about 45 km northwest of Huesca. The highest, the north spur of the Pisón, reaches 275 metres, and the Visera mallo holds Spain's largest climbing roof, with a 60-metre overhang. Vultures nest on its walls, giving their name to the site known as Paredón de los Buitres. A world climbing reference since 1935, it now offers routes of all levels, as well as via ferratas and base jumps. Photo: Xufanc (Wikimedia Commons) (CC BY-SA 3.0) What to see and do in Las Peñas de Riglos