The Rio Uraricoera is a significant river in the state of Roraima in northern Brazil. It is a headwater of the Rio Branco, formed at its confluence with the Takutu River. The river is described as powerful. A major natural feature associated with the river is Maracá Island, which is enclosed by two channels of the Uraricoera. This island is a strict-protection stronghold famous for long-running rainforest ecology studies and is noted for exceptional primate and bird populations. The surrounding area is a rainforest environment. The river's role in forming the Branco River and its association with the protected Maracá Island are points of historical and ecological significance. Paddlers should be aware of the river's power and the presence of a protected ecological area, which may imply specific regulations.