What is the setting of Born to Run: A Hidden Tribe, Superathletes, and the Greatest Race the World Has Never Seen by Christopher McDougall?

Various locations in McDougall's book, Born to Run: A Hidden Tribe, Superathletes, and the Greatest Race the World Has Never Seen, include Mexico, Sierra Madre, the Copper Canyons, Guachochi, Yerbabuena, Leadville and the Russian Outback.