It is a left tributary of the Maracanã River.

[1] The lower reaches of the river are protected by the 30,179 hectares (74,570 acres) Maracanã Marine Extractive Reserve, created in 2002.

[2] The river is mainly surrounded by forest.

[3] The region has a relatively low population, with 43 people per square kilometer.

[5] Average annual rainfall is 2,830 millimetres (111 in).