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For those who don't know, Réunion Island is the site of a well-known Ultra Trail World Tour event. The 100 mile race, La Diagonale des Fous, weaves through the mountains from the south coast to the north coast. A typical 100 mile trail race has a time limit of 30-34 hours but this race has a time cut-off around 64 hours, which gives you an idea of the trails. Supposedly, the terrain is "brutal" and organizers don't permit poles in spite of 9,500+ meters of climb and slippery mud.