The document summarizes key information about the Amazon river and rainforest. The Amazon river begins in the Andes mountains and flows over 6,400 kilometers through South America, reaching over 190 kilometers wide during wet seasons. It is home to over 3,000 known fish species, including piranhas. The adjacent Amazon rainforest produces about 20% of the world's oxygen and houses extensive biodiversity. Both systems are under threat and protecting the Amazon is crucial.