A boat sailing through one of the tributaries of the Amazon to Iquitos about 40 miles near the town of Indiana. Amazon traditionally assigned to second place in total length, behind the Nile, though there has never been a general consensus on what the acceptable measurement points. The latest research, adding some 740 km to the channel, which would place him definitely in the top of the ranking of largest rivers in the more conservative mundo.Según measurements, the river is about 6,762 km long. However, a Peruvian-Brazilian expedition has completed its work in June 2007 has been estimated Km.1 6800 this section of great variability in the channel. At the mouth of the distance of a bank to the other is about 330 km, measured from Cabo do Norte to Punto Patijoca and including the island of Marajo (pronounced: Mara), the size of Denmark and the Pará River Delta (section Tocantins river's end), about 60 km wide. The distance from the mouth of the Amazon, made up a kind of delta masked by the action of tides and currents, is about 100 km aproximadamente.Actualmente, by recent research reports, Lima Geographical Society, supported by entities of the international scientific community, ended the controversy over the origin of the Amazon River to determine which rises in the Andes of southern Peru and is the longest in the world, exceeding the Nile River in more than forty kilómetros.Desde birth in the gorge Apacheta, on the slopes of Nevado Quehuisha in the department of Arequipa, 5,170 meters of altitude, until it empties into the Atlantic after visiting Peru and Brazil, reaching a length of 7,062 kilómetros.Esto 391 kilometers makes it longer the Nile in Africa, which stretches 6,671 km, they said the expert Zaniel Novoa, Lima Geographical Society, and Polish journalist and explorer Jacek Palkiewicz, who in 1996 led a multinational expedition to the headwaters of the Amazon. It was established that measurement, which after 12 years was validated by major entities of the international scientific community. These include the Geographical Society of London, the Russian Academy of Sciences and the Brazilian Institute for Space Research.