Just outside Oaxaca we headed the expedition vehicle up into the Sierra Juarez mountains, named after one of Mexicos most famous leaders who was born in these parts. Twisting almost unceasingly, we bounced along the patchwork quilt road surface, climbing ever higher until we eventually topped out at a little over 9600 feet. As we began the equally tortuous decent, the transition from the more arid Pacific side into the humid Gulf coast climate was unmistakable, with exquisite flowering trees and lush ferns crowding the road and natural springs gushing out every few miles.