<P> A 2014 study by Americans James Contos and Nicolas Tripcevich in Area , a peer - reviewed journal of the Royal Geographical Society , however , identifies the most distant source of the Amazon as actually being in the Río Mantaro drainage . A variety of methods were used to compare the lengths of the Mantaro river vs. the Apurímac river from their most distant source points to their confluence , showing the longer length of the Mantaro . Then distances from Lago Junín to several potential source points in the uppermost Mantaro river were measured , which enabled them to determine that the Cordillera Rumi Cruz was the most distant source of water in the Mantaro basin ( and therefore in the entire Amazon basin ) . The most accurate measurement method was direct GPS measurement obtained by kayak descent of each of the rivers from their source points to their confluence ( performed by Contos ) . Obtaining these measurements was difficult given the class IV -- V nature of each of these rivers , especially in their lower `` Abyss '' sections . Ultimately , they determined that the most distant point in the Mantaro drainage is nearly 80 km farther upstream compared to Mt . Mismi in the Apurímac drainage , and thus the maximal length of the Amazon river is about 80 km longer than previously thought . Contos continued downstream to the ocean and finished the first complete descent of the Amazon river from its newly identified source ( finishing November 2012 ) , a journey repeated by two groups after the news spread . </P>
<P> A 2014 study by Americans James Contos and Nicolas Tripcevich in Area , a peer - reviewed journal of the Royal Geographical Society , however , identifies the most distant source of the Amazon as actually being in the Río Mantaro drainage . A variety of methods were used to compare the lengths of the Mantaro river vs. the Apurímac river from their most distant source points to their confluence , showing the longer length of the Mantaro . Then distances from Lago Junín to several potential source points in the uppermost Mantaro river were measured , which enabled them to determine that the Cordillera Rumi Cruz was the most distant source of water in the Mantaro basin ( and therefore in the entire Amazon basin ) . The most accurate measurement method was direct GPS measurement obtained by kayak descent of each of the rivers from their source points to their confluence ( performed by Contos ) . Obtaining these measurements was difficult given the class IV -- V nature of each of these rivers , especially in their lower `` Abyss '' sections . Ultimately , they determined that the most distant point in the Mantaro drainage is nearly 80 km farther upstream compared to Mt . Mismi in the Apurímac drainage , and thus the maximal length of the Amazon river is about 80 km longer than previously thought . Contos continued downstream to the ocean and finished the first complete descent of the Amazon river from its newly identified source ( finishing November 2012 ) , a journey repeated by two groups after the news spread . </P>
where is the source of the amazon river found
where is the source of the amazon river found
Río Mantaro
Río Mantaro