The pororoca (poɾoˈɾɔkɐ) is a tidal bore, with waves up to 4 metres high that travel as much as 800 km inland upstream on the Amazon River and adjacent rivers. Its name comes from the indigenous Tupi language, where it could translate into `great roar`. It could be also a Portuguese version of the term poroc-poroc, which in the native indig.....
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http://en.wikipedia.org/wiki/Pororoca
(from the article `Amazon River`) ...Guiana. As a consequence, the river is not building a delta. Normally, the effect of the tide is felt as far upstream as Óbidos, 600 miles from ...
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http://www.britannica.com/eb/a-z/p/95
a phenomenon that occurs at the mouth of the Amazon River in which the incoming tide forms waves of up to 13 feet high that travel upriver; also known as a tidal bore
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http://www.pbs.org/kqed/oceanadventures/glossary/
No exact match found.
