The Campos Amazônicos National Park covers parts of the municipalities of Novo Aripuanã (66.69%), Manicoré (14.73%) and Humaitá (5.01%) in Amazonas, Machadinho d'Oeste (12.91%) in Rondônia and Colniza (0.38%) in Mato Grosso.

Mixed groups of woolly monkeys and white-nosed saki (Chiropotes albinasus) have been observed, an unusual occurrence in the Amazon.

[1] The Campos Amazônicos National Park was created by decree of 21 June 2006 with an area of about 873,570 hectares (2,158,600 acres) to protect biological diversity and ecological processes in the region between the Machado, Branco, Roosevelt and Guaribas rivers.

If another part of the buffer zone is excluded the actual park area was about 823,000 hectares (2,030,000 acres).

All of these were reduced in size except the Campos Amazônicos, which was increased by a net 133,000 hectares (330,000 acres) including land added and removed.

Excluded land also included the area to be flooded by the Tabajara Dam for hydroelectric power generation.

[1] The Campos Amazônicos National Park is administered by the Chico Mendes Institute for Biodiversity Conservation (ICMBio).

The objective is to preserve a natural ecosystem of great ecological relevance and scenic beauty, and to support scientific research, environmental education and interpretation, outdoors recreation and ecotourism.

Specifically it protects the main cerrado enclave in the Amazon and contains the advance of the agricultural frontier in this region.