A tributary of the Amazon, the Curua Una River, which runs through the state of Pará in northern Brazil, will immerse you in the extraordinary ecosystem of the Amazon Jungle. Its fish-filled waters are home to many piranhas, but also caymans and river dolphins. The shores are lined with dense tropical rainforest in which an extremely rich fauna can be found. Amid the thick branches, parrots, egrets, monkeys, lizards and toucans will likely allow you to observe them, offering you an absolutely magical spectacle.