The Rio Grande at Big Bend National Park

A cactus blooms above the Rio Grande in Big Bend National Park. 

For river trip information and regulations visit these links:
http://www.nps.gov/bibe/parkmgmt/riverregs.htm
http://www.nps.gov/bibe/planyourvisit/floating_the_rio.htm

Thanks to NPS for use of this photo!