The Cotahuasi Canyon, near the Peruvian city of Arequipa, was formed by the Cotahuasi river. Running between the enormous mountain massifs of Coropuna (6425 m) and Sulimana (6093m), it is the deepest canyon (3354 m) in the world.
Discovered on 9-11-1991 in La Silla by Elst, E. W.