Iriri River Terra do Meio Ecological Station. The river varies greatly in volume depending on the season, and in the dry season include waterfalls, rocks and rapids. The Iriri River flows through the Tapajós-Xingu moist forests ecoregion. The river is rich in fish, including many species found only here and in the Xingu. Large sections remain unexplored due to its remoteness in a region surrounded by Amazon rainforest, and sections with strong current and cataracts. 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
Xingu peoples number had been reduced by foreign epidemic diseases such as flu, measles, smallpox and malaria to less than 1,000. Only an estimated 500 Xingu peoples were alive in the 1950s. The Brazilian Villas-Bôas brothers visited the area beginning in 1946, and pushed for the creation of the Parque Indígena do Xingu, eventually established in 1961. Their story is told in a film, "Xingu". The number of Xingu living there in 32 settlements has risen again to over 3000 inhabitants, half of them younger than 15 years. The Xingu living in this region have similar habits and social systems, despite different