Video clips of a surfer riding a monster 80-foot wave off Portugal have been making the rounds on the Internet. (www.youtube.com/watch?v=ZOwodcqGRvM) Nazaré, north of Lisbon, has long been a destination for surfers seeking giant waves. The physical geography of the seafloor off Nazaré is responsible for this: the 5,000-meter-deep Nazaré canyon regularly channels big waves towards the coast. When the energy of these big waves is amplified by constructive interference, they can become the monster waves that contribute to surfing records.
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