Amazon River, Physiography of the river course

The Amazon River has its main outlet north of Maraj� Island, a lowland somewhat larger in size than Denmark, through a cluster of half-submerged islets and shallow sandbanks. Here the mouth of the river is 40 miles (64 kilometres) wide. The port city of Bel�m is on the deep water of the Par� River, an estuary marking the south side of Maraj�, which is fed chiefly by the Tocantins