Iriri River Iriri River The Iriri River () is a large tributary of the Xingu River in Brazil, in the state of Pará. It is long making it the 116th longest river in the world (with Krishna River, India) and the 15th longest in the Amazon basin. The headwaters are the traditional home of the Panará people. The river rises in the Nascentes da Serra do Cachimbo Biological Reserve, a strictly protected conservation unit established in 2005 in the Serra do Cachimbo. It is one of the headwaters of the Xingu River. It flows for before joining the Xingu, running through the
Xingu-Tocantins-Araguaia moist forests World Wildlife Fund classes the ecoregion "Vulnerable". The Tapajós-Xingu, Xingu-Tocantins-Araguaia and Tocantins/Pindare moist forests ecoregions on the eastern edge of the Amazon basin have all been badly affected by human settlement and deforestation. The Xingu-Tocantins-Araguaia region is the most deforested and degraded part of the Amazon region after the adjoining Tocantins/Pindare moist forests to the east. It is crossed by the Trans-Amazonian Highway (BR-230) from east to west, and by the BR-422 highway along the Tocantins. Most of the land along these roads has been deforested and replaced by pasture or farm fields. The remaining forest has been stripped of