Runners descend a steep and windy dirt road in the Copper Canyon Ultra Marathon.
Maria Juliana leads a group of Tarahumara Indians on a trail run outside the town of Urique.
Caballo Blanco (Micah True) crosses the river during the first leg of the Copper Canyon Ultra Marathon.
Tarahumara run the 51-mile ultra marathon in huaraches, sandals made of tire tread and leather straps.
A Tarahumara wearing traditional clothing runs along the road.
Foreign runners rest their legs after the punishing 51-mile race.
A panoramic view of the Copper Canyon from Bahuichivo, Mexico.
A group scouts the course two days before the race.
A Tarahumara runner rests after the race.
An Urique resident watches the race.