Below Boquillas Canyon and the boundary of Big Bend National Park, lies the third longest wilderness river section in the continental US. River enthusiasts putting in at Heath Canyon Ranch, across the river from La Linda, Coahuila, must travel over 85 river miles before the next public access at Dryden Crossing.
Mariscal is the most remote of the Park River Canyons, and the only way to see it is by river. Getting to the put-in point at Talley requires over 30 miles of driving on rough dirt road. It is important to check road and weather conditions before entering this remote desert backcountry. Difficult as it may be to get there, the trip is worth well worth the effort.