Question: when did the amazon river become the longest
Answer: New evidence , ( dated 16 June 2007 ) obtained from a high - altitude scientific venture in the Andes , claims that `` the Amazon is longer than the Nile by 100km , with its longest headwater being the Carhuasanta stream originating in the south of Peru on the Nevado Mismi mountain 's northern slopes and flowing into the Río Apurímac '' .