Jamanxim National Park, Protected rainforest reserve in Pará, Brazil

Jamanxim National Park is a large rainforest reserve in Pará spanning across three municipalities with flat terrain and river networks. The landscape consists of continuous forest with waterways that are essential to its ecology.

The park was created in 2006 by the Brazilian government to protect forest areas from deforestation and mining. Its establishment was part of broader efforts to preserve Amazon regions as protected conservation areas.

The park's cultural story is one of settlement and conflict rather than indigenous tradition. From the 1960s, military "integrar para não entregar" policies brought cattle ranchers into the area along BR-163. When the park was decreed in 2006 without prior studies, it overlapped these occupations, creating disputes among posseiros, grileiros and the federal government that continue today.

The BR-163 highway crosses the park from north to south, and the park lies in parts of Altamira, Itaituba and Trairão. There are no fauna crossings or signage along this stretch, so road travel carries collision risk for species such as Ateles marginatus. Rainfall averages 2,228 mm a year, with temperatures between 24 and 33 °C.

Surveys by the PIME, PUCA and Rapid Ecological Assessment projects between 2008 and 2012 recorded at least eight primate species, among them Mico leucippe, Chiropotes albinasus and Ateles marginatus. Saimiri ustus was confirmed only through interviews with local residents, and Plecturocebus vieirai and Mico emiliae may occur in the southeast but have not been observed directly. The park links the Tapajós and Terra do Meio conservation units as an ecological corridor.