Going against the flow

Picuruta Salazar rides the "Pororoca," a wave that flows upstream and reaches a height of 4 meters on the world's second longest river, the Amazon, in Brazil, in this undated photo. The Pororoca happens every year between February and March when the ocean whips back on the heavily drained Amazon and creates a giant swell that flows upstream for hundreds of miles. Salazar, a Brazilian, rode the dirty brown wave for 37 minutes, traveling 12 kilometers through the rainforest.

via MSNBC Week in Pictures