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
Tapajós-Xingu moist forests Tapajós-Xingu moist forests The Tapajós-Xingu moist forests (NT0168) is an ecoregion in the eastern Amazon basin. It is part of the Amazon biome. The ecoregion extends southwest from the Amazon River between its large Tapajós and Xingu tributaries. The Tapajós-Xingu moist forests lie between the Tapajós river to the west and the Xingu rivers to the east, tributaries of the Amazon River to the north. They have an area of . The rivers act as barriers to the movement of plants, animals and insects to and from adjacent regions. In the south the rugged Serra do Cachimbo divides the ecoregion