Jamanxim River Jamanxim River The Jamanxim River is a river of Pará state in north-central Brazil. Originating in the Serra do Cachimbo, it is a tributary of the Tapajós, into which it flows a few kilometers upstream from Itaituba. The river flows through the Tapajós-Xingu moist forests ecoregion. It flows through the Itaituba I National Forest, a sustainable use conservation area established in 1998. The river basin also contains part of the Rio Novo National Park, a conservation unit created in 2006. Its hydroelectric potential, along with that of the Tapajós, was assessed by Eletronorte (Centrais Elétricas do Norte do Brasil S.A.),
Tapajós-Xingu moist forests from other moist forest areas. There are urban centers at Santarém at the mouth of the Tapajós, Aveiro on the lower Tapajós and Altamira on the Iriri River. The ecoregion is crossed by the Trans-Amazonian Highway (BR-230) and the BR-163 highway from Santarém to Cuiabá. To the northwest the ecoregion adjoins the Madeira-Tapajós moist forests on the other side of the Tapajós River. To the north it adjoins the Gurupa várzea along the Amazon River. The Uatuma-Trombetas moist forests are on the opposite bank of the Amazon. To the east are the Xingu-Tocantins-Araguaia moist forests. To the south and southwest