Telephone Canyon is a 33.62-mile out-and-back foot trail in Big Bend National Park, Texas. It climbs 2,539 ft to a high point of 4,430 ft. Difficulty: very strenuous, from the NPS hiking-rating formula.
Open Telephone Canyon on Trailbound's interactive map to see the full route, the elevation profile, today's forecast and any park alerts for Big Bend. Big Bend has permits or reservations for some areas: see the Big Bend page for what's needed.