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Photo: James de Souza, CC BY-SA 3.0 via Wikimedia Commons
To visit the nearby Amazônia National Park, you must obtain permission from IBAMA. They have an office in Itaituba.
The Amazônia National Park was created in 1974, as a national park comprising 1,070,737 ha. It is situated in Itaituba and Trairão municipalities, Pará state, in the north region of Brazil. It is located in the watershed of the Tapajós River, about halfway between Manaus and Belém. It has expanded since its inception and now covers 8,600 square kilometres (3,300 mi2). It is a very biodiverse habitat and contains a wide range of animals and plants. The specific objectives of the park are the preservation of various Amazonic ecosystems, through scientific, educational and recreational means.
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IBAMA / Parque Nacional da Amazônia
To visit the Amazônia National Park, you need to get a permit. One can be obtained here. You need your passport - maybe also a photocopy and some 3x4 cm photos. Call ahead because "office hours" may be variable.