The pororoca is a tidal bore up to 4 meters high that travels upstream the Amazon River. Its name comes from the indigenous Tupi language, where it translates into "great destructive noise". It occurs at the mouth of the river where river water meets the Atlantic Ocean. The phenomenon is best seen in February and March, where waves up to 4 meters rolling for up to 35 minutes have been observed. The tidal bore in Upper Cook Inlet, Alaska A tidal bore (or just bore, or eagre) is a tidal phenomenon in which the leading edge of the incoming tide forms a wave (or waves) of water that travel up a river or narrow bay against the direction of the current. ... The Amazon River (occasionally River Amazon; Spanish: Río Amazonas, Portuguese: Rio Amazonas) of South America is one of the two longest rivers on Earth, the other being the Nile in Africa. ... Tupi is the name of one of the main ethnic groups of Brazilian indigenous people, together with the related Guarani. ...

The wave has become popular with surfers. Since 1999, an annual championship has been held in São Domingos do Capim. However, surfing the Pororoca is especially dangerous, as the water contains numerous deadly animals, such as the piranha and the candiru. Surfing outside Kaneohe Bay, Hawai‘i. ... Genera Catoprion Citharinus Pristobrycon Pygocentrus Serrasalmus The piranhas or pirañas are a group of carnivorous freshwater fish living in South American rivers. ... Species Ref: FishBase 2002-08-10 The candirú or canero (Vandellia cirrhosa) is a freshwater fish in the group commonly called the catfishes. ...

External links

• http://boreriders.com/pororoca/
• http://playak.com/article.php?sid=1179

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