Crossing a river where piranhas thrive, crossing a swamp where anacondas lurk, scaling insane muddy slopes. All this beneath a thick canopy without a shred of sunlight at 40o C with 99% humidity through Brazils Amazon rainforest. This marathon and ultramarathon is not for the faint of heart. The few bravehearted men and women run the worlds wildest eco race from the village of Alter do Chao to the base camp in Santarem, Brazil in the month of October. What better way to experience the mighty amazon jungle?