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 State Park the Xingu River. It adjoins the Capoto/Jarina Indigenous Territory to the west. Its boundary to the north is the border with the state of Pará. To the east the Fontourinha stream defines its boundary. The park is in the Amazon biome. 81.87% of the park is covered by savanna/pioneer contact, and 18% by savanna/rainforest contact. Xingu State Park was created by decree 3.585 of 7 December 2001 with an area of about . It was redefined by law 8054 of 29 December 2003, signed by the state governor Blairo Maggi, which reduced its size to . The reduction was justified