phenomenon , known as Pororoca

Twice a year, on February or March, the Atlantic Ocean waters roll up the Amazon river, in Brazil, generating the longest wave on the Earth. The phenomenon, known as the POROROCA is caused by the tides of the Atlantic Ocean wich meet the mouth of the river. This tidal bore generates waves up to 12 feet high which can last for over half an hour. The name "Pororoca" comes from the indigenous Tupi language, where it tmeans "great destructive noise". The wave can be heard about 30 minutes before, and it's so powerful that it can destroy anything- trees, local houses and all kind of