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The Amazon River (Portuguese: Rio Amazonas, Spanish: Río Amazonas) in South America is the largest river by discharge of water in the world and according to some authors, it is the longest in length. The headwaters of the Apurímac River on Nevado Mismi had been considered for nearly a century as those of the main stem of what was then called "Rio Grande" or "Amazon". It was only with detailed mapping and measurements during an expedition led by Ivan Cézar Quartim de Moraes that its sources were established beyond doubt as being located at 19°53′28″S 77°22′40″W / 19.88889°S 77.37222°W / -19.88889; -77.37222 on Cerro da Neblina at an elevation above sea level about 5,100 metres (16,700 ft).