![]() Since 1999, an annual championship has been held in São Domingos do Capim (on the adjacent Guamá River). The wave has become popular with surfers. On an equinoctial spring tide, the Moon and Sun fall into direct alignment with the Earth, and their gravitational pull is combined, bringing the Pororoca and others around the world to their peak. The tidal phenomenon is best observed on biannual equinoxes in September and March during a spring tide. The Amazon's flow reverses, the distance of which depends largely on the rainwater-generated outflow of the Amazon, and a water bulge speeds upstream often with great force, forming a tidal bore with an audible noise. It occurs at the mouth of the river where its waters meet the Atlantic Ocean.Įxplanation Map showing the M2 tidal constituent as quite high in this area, meaning greater tidesĭuring new and full moons, when the ocean tide is highest, water flows in from the Atlantic, rather than the other way around. It could be also a portmanteau of the words poroc (to take out, to tear away) and oca (house). It could be also a Portuguese version of the term poroc-poroc, which in an indigenous' language was a way of expressing the act of destroying everything. Its name might come from the indigenous Tupi language, where it could translate into "great roar". The Pororoca ( Portuguese pronunciation:, ) is a tidal bore, with waves up to 4 m (13 ft) high that travel as much as 800 km (500 mi) inland upstream on the Amazon River and adjacent rivers.
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