Mapuá River
The Mapuá River is a river of Marajó, which itself is an island in the mouth of the Amazon. It is a left tributary of the Aramá River.
Course
The Mapuá River rises on the island of Marajó in the delta region where the Amazon and Tocantins rivers empty into the Atlantic Ocean.It runs along the southern boundary of the Mapuá Extractive Reserve.
The Mapuá is a left tributary of the Aramã, which forms the northern boundary of the reserve.
The reserve contains sheets of tidal water and mangroves.
The reserve is mostly lowland floodplain, with some terra firma in the centre of the territory.