In Mato Grosso the river forms the western boundary of the 13,683 hectares (33,810 acres) Rio Madeirinha Ecological Station, a fully protected environmental unit created in 1997.

[1] It then flows north east through the Tucumã State Park in Mato Grosso and the 83,381 hectares (206,040 acres) Manicoré State Forest in Amazonas, a sustainable use conservation unit created in 2005.

[2] It continues north east from the state forest before joining the Roosevelt river.

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