] Swell ride: Brazilian surfer Picuruta Salazar rides the
] "Pororoca," a 12-foot wave that flows upstream once a
] year on the Amazon. The wave occurs when the ocean whips
] back on the heavily drained river, creating a giant curl
] that flows for hundreds of miles. Salazar rode this
] year's Pororoca through the rainforest for 37 minutes --
] a surfing record.

SF Gate: Day In Pictures - Swell ride