The area is drained by the Acapu River and the Arrozal, Candieiro, Mungubal and Cabeceira Grande streams.

Numerous lakes in the floodplain are permanently connected to the Trombetas River, forming a large wetland.

[2] The diverse plant species include manilkara huberi, caryocar, dipteryx odorata, chrysophyllum, goupia glabra, copaiba, bertholletia excelsa, anacardium giganteum and palms such as attalea maripa, oenocarpus bacaba and astrocaryum vulgare.

Migratory bird species include osprey (pandion haliaetus), collared plover (charadrius collaris) and large-billed tern (phaetusa simplex).

[2] Since 2002 management of the Rio Trombetas Biological Reserve and the Saracá-Taquera National Forest, which is adjacent to the south, has been combined.