Colca Canyon is a canyon of the Colca River in southern Peru. With a depth of 10,725 ft (3,270 m), it is one of the deepest canyon in the world, more than twice as deep as the Grand Canyon in the United States. The Colca Valley is a colorful Andean valley with pre-Inca roots, and towns founded in Spanish colonial times, still inhabited by people of the Collagua and the Cabana cultures. The local people maintain their ancestral traditions and continue to cultivate the pre-Inca stepped terraces.