The Sierra Madre Occidental is the southern continuation of the Rocky Mountain range. It contains various canyons (barrancas) that carve the landscape into a labyrinth of pines and cliffs. Copper Canyon (Barranca del Cobre), perhaps the most popular range of canyons, covers a larger area and is deeper at is maximum depth than the Grand Canyon. A system of paved and dirt roads cut out of the mountainsides create world class riding and breathtaking views, attracting adventure motorcyclists like moths to a flame. Recent improvements have converted some of the dirt roads to asphalt, making areas more accessible (and safer) for tourists and Mexicans alike. Yet there still remains innumerable unpaved routes where the most brazen adventurers can get intentionally lost.