[3] The terrain bordering the Madeira River alternates between floodplains and lacustrine plains formed by accumulated sediments.

It is classified as open tropical rainforest, with spaced-out individual trees and many clusters of palms, bamboos and lianas.

The purpose is to protect the headwaters of the Aponiã and Cuniãzinho streams, tributaries of the middle Madeira River, with ecosystems in the transition from Savannah to Forest, and to support development of knowledge about the biodiversity of the Amazon region.

[4] An ordinance of 9 January 2012 provided for a consistent and integrated approach to preparing management plans for the conservation units in the BR-319 area of influence.

All three are managed by ICMBio and have complementary objectives in maintaining a total of 408,000 hectares (1,010,000 acres) of Amazon biome and its transition to savannah.