World's Most Extreme Adventure Races

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World's Most Extreme Adventure Races

From dizzying altitudes to scorching deserts, these 11 ultramarathons, ironman triathlons, and obstacle courses call for almost super human strength.

Jungle Marathon - Floresta National de Tapajos, Amazon Rainforest, Brazil

Held in Brazil’s Amazon rainforest in October, Jungle Marathon offers two races to choose from: 63 miles in four stages, or 150 miles in six stages. Racers are required to carry food and provisions, and race officials provide bottled water only at checkpoints. Youʼll face all the hazards the jungle has to offer (think: swamps, anacondas, and poisonous plants). You'll sleep in strung-up hammock between stages, with the only distractions being questioning your sanity, your aching body, and the jungle wildlife. (junglemarathon.com)

Badass Score: 8

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