It's hard enough to drive through the Arizona desert, where the sun is harsh and the distances immense. This is the story of people who walk it.
In particular, it's the story of Brenda, who asked us to use only her first name. She told us yet another of the unbelievable stories you hear in the Borderland.
We met her in Nogales, Sonora, on the northern border of Mexico opposite Arizona. She was living in a shelter for deported people, where she told us of her brief and difficult stay in the United States.