Which is the main port on the River Amazon estuary?
Amazon River a line of low bluffs bordering the floodplain extends nearly to Santarém in a series of gentle curves before they bend to the southwest, and, abutting upon the lower Tapajós, merge into the bluffs which form the terrace margin of the Tapajós river valley. Belém is the major city and port at the mouth of the river at the Atlantic Ocean. The definition of where exactly the mouth of the Amazon is located, and how wide it is, is a matter of dispute, because of the area's peculiar geography. The Pará and the Amazon are connected by a series of
Amazon River river channels called "furos" near the town of Breves; between them lies Marajó, the world's largest combined river/sea island. If the Pará river and the Marajó island ocean frontage are included, the Amazon estuary is some wide. In this case, the width of the mouth of the river is usually measured from Cabo Norte, the cape located straight east of Pracuúba in the Brazilian state of Amapá, to Ponta da Tijoca near the town of Curuçá, in the state of Pará. A more conservative measurement excluding the Pará river estuary, from the mouth of the Araguari River to Ponta do