Watch Free Online HD Moviesjoy. In the annual Ultra Maratón Caballo Blanco, runners compete in the spectacular Copper Canyon of Chihuahua, Mexico, home to the indigenous Rarámuri people. The town of Urique has hosted the event since 2004, after an American athlete created the race as a way for the Rarámuri, who are known for their endurance running, to honor and preserve their culture.