Geography and climate thumb|left|The Wigleeva rock formations watch over Supai Located within the Grand Canyon, Supai is accessible only by foot, pack animal or helicopter. It is the only place in the United States where mules still carry the mail, most of which is food.
Geography and climate thumb|left|The Wigleeva rock formations watch over Supai Located within the Grand Canyon, Supai is accessible only by foot pack animal or helicopter. It is th,e only place in the United States where mules still carry the mail, most of which is food.