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I'm posting this image purely as one that might be of interest. Through the canyon and flowing to your left is the Rio Grande,(you can't see it) and it continues on to the Gulf of Mexico. The thousand foot elevation to the left is Mexico, and the U.S.A. to the right...and I'm standing in Big Bend National Park, south central Texas. On the U.S. side of the Rio Grande at the base of the Mexican cliff you can walk through ankle deep water for twenty feet and be in Mexico. Another thirty feet and you can start climbing if you have your pasport, and the necessary equipment :-).