Boquillas Canyon is the longest and deepest canyon in Big Bend National Park. The vertical relief from nearby Pico del Carmen, to river level is over 7,000 feet, somewhat deeper than the Grand Canyon of the Colorado.
Colorado Canyon, in Big Bend Ranch State Park, is the most accessible of the area’s major river canyons, and offers vehicle accessible views of the river as well as a choice of short float trips.
Ross Maxwell Scenic Drive is the most interesting of the paved sightseeing routes in Big Bend National Park, giving the greatest variety of habitats, geology and a variety of interesting short walks and interpretive pull overs.
nature trail enters its shady depths, 8 miles west of Castolon, accessible by either Ross Maxwell Scenic Drive or the Old Maverick Road.