It's been a long but very worthwhile journey. You've reached the heart of the Tarahumara Mountains in the northeast corner of Chihuahua state and find yourself standing atop the majestic heights known as Las Barrancas del Cobre (Copper Canyon), a name that derives from the stunning greenish copper hue of the canyon walls. Spanning a total length of 59,545 km. (37,000 miles), these canyons are longer and deeper than the Grand Canyon in Arizona. Their mighty walls conceal remarkable legends, traditions and surprises.