A geological complex located in Suykutambo district, Espinar province, Cuzco region, 4,801 metres above sea level. The meeting point for three rivers: the Apurímac, the Callumani and the Cerritambo, which together from the Great Apurímac. It boasts imposing, 80-metre high geological formations of volcanic origin, which give the place its name and through which the rivers run, as well as rich forests of queñuas (Polylepis) and tholas (Parastrephia lepidophylla).
The rivers, slops and plateaux of the area allow tourists to participate in adventure sports like trekking, paragliding, canoeing and rock climbing. The Eco-Sport Tourism Festival and Traditional Dance Festival are held here every year.