Curuá River (Iriri River) Curuá River (Iriri River) The Curuá River is a tributary of the Iriri River in Pará state in north-central Brazil. It is a tributary of the Iriri River. The river flows through the Tapajós-Xingu moist forests ecoregion. The river rises in the Nascentes da Serra do Cachimbo Biological Reserve, a strictly protected conservation unit established in 2005. It is one of the headwaters of the Xingu River. The upper part and the lower part of the Curuá River are divided by two waterfalls, only apart. The first waterfall is tall and the second is tall. As a consequence, the fauna
Tapajós-Xingu moist forests the ecoregion blends into the Mato Grosso seasonal forests ecoregion. Elevations range from above sea level along the Amazon to in the south. The ecoregion mostly lies on the undulating terrain of the ancient Brazilian Shield. Soils are often rich in nutrients, but poor soils are found in the higher areas. The main rivers are blackwater, with little or no suspended sediment. The largest is the Iriri, a tributary of the Xingu. Others are the Jamanxim, Curuá, Crepori, Curuá Una, and Jaraucu. The ecoregion is in the neotropic ecozone and the tropical and subtropical moist broadleaf forests biome. The Köppen