The 2015 edition of the Jungle Marathon saw 11 of the 41 starters drop out on the gruelling 254km course in Brazil's Tapajos National Forest. The course took runners through Amazonian jungle and included several river and swamp crossings in an area known for piranhas, caimans, anacondas, jaguars and venomous snakes.

This year's winner was Thomas Wittek from Germany, who finished in 40 hours and 10 minutes. Second in 40 hours, 40 minutes was Andres Lledo of Spain, with Slovenia's Miha Podgornik and Matez Kordev joint third in 41 hours, 10 minutes. The women's race winner was Alma Vitola of Latvia, who clocked 56 hours, 48 minutes. The veteran category was won by 64-year-old Luis Barco from Argentina.

Runners from Australia, New Zealand, Canada, the US, Japan, Germany, Austria, the UK, Latvia, Slovenia, Spain, Brazil and Argentina took part.