If surfing, the ancient art of wave riding, was transformed into music, it would sound like a blazing electric guitar, not a symphony. Surfers generally get just a fleeting stage on which to dance, as ocean waves that have traveled hundred of miles explode on shore in a matter of few seconds. But not in Brazil.
There like a mysterious beast, rises the wave known as the POROROCA - the name means "mighty noise". Twice a day around the new and full moons during the spring and fall, walls of chocolate-colored water rear up in several rivers in northern Brazil. The most powerful occurs in the Araguari, leaving a path of bankside destruction and flooding in its wake.
Scientists call such waves as tidal bores. They are a regular phenomenon in many rivers around the world where a powerful incoming tide collides with a river's outflow.
For surfers, bores are far from boring. Ten-minute rides are common on a pororoca, which was first surfed in 1997.Brazilian surf star Alex