 The Rio Grande River where it enters Santa Elena Canyon in Big Bend National Park |
 The 1500 foot limestone cliffs of Santa Elena Canyon in Big Bend National Park |
 The Rio Grande River cutting through Santa Elena Canyon in Big Bend National Park |
 The Rio Grande River in Santa Elena Canyon in Big Bend National Park |
 The Mexican cliffs of Santa Elena Canyon in Big Bend National Park |
 Looking out of Santa Elena Canyon in Big Bend National Park |
 The Rio Grande River where it enters Santa Elena Canyon in Big Bend National Park |
 The Mexican wall of Santa Elena Canyon in Big Bend National Park |
 Santa Elena Canyon (Mexico on the left, US on the right) in Big Bend National Park |
 Santa Elena Canyon as viewed from the Old Maverick Road in Big Bend National Park |
 View along the Ross Maxwell Scenic Drive in Big Bend National Park |
 Cerro Castellan (3293 ft.) along the Ross Maxwell Scenic Drive in Big Bend National Park |
 A Roadrunner with its prey in Big Bend National Park |
 Lechuguilla plant in Big Bend National Park |
 A Prickly Pear cactus with long needles in Big Bend National Park |
 Working windmill at the ruins of the Sam Nail Ranch site in Big Bend National Park |
 Remains of an adobe structure at the site of the Sam Nail Ranch in Big Bend National Park |
 Ravens perched in a dead tree in Big Bend National Park |
 An old windmill at the Sam Nail Ranch with the Chisos Mountains in the background in Big Bend National Park |
 Rock Nettle flowers in Big Bend National Park |
 Torrey Yucca plant blooming in Big Bend National Park |
 Box canyon along the Burro Mesa Pouroff Trail in Big Bend National Park |
 Burro Mesa Pouroff, a sheer runoff chute, in Big Bend National Park |
 Canyon cliffs along the Burro Mesa Pouroff Trail in Big Bend National Park |
 Torrey Yucca plant bloom in Big Bend National Park |
 Mule Ears Peaks from the overlook in Big Bend National Park |
 Hedgehog cactus with the Mule Ears Peaks from the Mule Ears Spring Trail in Big Bend National Park |
 Crystals on the Pack Trail past Mule Ears Springs in Big Bend National Park |
 Sotol plants on the Mule Ears Springs Trail in Big Bend National Park |
 Mule Ears Peaks from the Pack Trail in Big Bend National Park |
 Long needle Prickly Pear cactus along the Pack Trail in Big Bend National Park |
 Moth at Mule Ears Spring in Big Bend National Park |
 Cactus along the Mule Ears Spring Trail in Big Bend National Park |
 Butterfly on a Desert Marigold in Big Bend National Park |
 Early morning light on a peak in Big Bend National Park |