PRAZ-DE-FORT, SWITZERLAND - AUGUST 30: Ultra Trail du Mont Blanc competitors running on valley. The ultra-marathon takes on aver

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PRAZ-DE-FORT, SWITZERLAND - AUGUST 30: Ultra Trail du Mont Blanc competitors running on valley. The ultra-marathon takes on average 30 to 45 hours to complete. August 30, 2014 in Praz-de-Fort.

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Size: 4896px × 3264px
Photo credit: © Nando Machado / Alamy / Afripics
License: Licensed
Model Released: No

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