It could very well be the giant catfish of the Amazon river. They regularly weigh more than 100 lbs., and the record for that part of the world is 295 lbs.
Answer
The anaconda is the largest and longest animal in the amazon forest, followed next by the spectated bear. Anacondas can grow as much as 10 meters or 33 ft long and weigh up to 550 pounds. Specated bears can weigh from 250 lbs to 450 lbs and stand up to 5'9 ft tall.
Black Caiman:
The largest predator in the Amazon river. It has no enemies other than man and can eat from piranha, capybara and giant river otters to humans.
The black caiman can grow to 20 feet long and reach up to 3,000 pounds in weight.
The first largest is a tree frog then the glompasorienotus', they are a giant species of walking whale and feast on annoying people that ask stupid questions like this.
Answer 2: Tapir
manatee
manatee
The largest mammal living in the Amazon River is the Tapir.
Manatee
a duck bill platypus
Its name is Boto, similar to a dolphin.
The Amazon is a large river in Brazil that flows into the Atlantic ocean.
The Amazon River
Originally from Greek mythology Amazon was a term applied to a mythical group of large, powerful women. Amazon came to mean large and powerful thus Amazon or large and powerful river.
The Amazon River has its mouth at the Atlantic Ocean. The Amazon River The Amazon is the largest river in the world at about 4,000 miles / 6,500 km
That would be the Amazon River.
Amazon river
The Amazon Basin