Amazon River

Major river in Northern South America

The Amazon River in South America is the largest river in the world by discharge volume of water, and the second-longest or longest river system in the world, a title which is disputed with the Nile. For nearly a century, the headwaters of the Apurímac River on Nevado Mismi in Peru had been considered the Amazon basin's most distant source, until a 2014 study found the farthest source to be the headwaters of the Mantaro River on the Cordillera Rumi Cruz in Peru. The Mantaro and Apurímac rivers join, and with other tributaries form the Ucayali River, which in turn meets the Marañón River upstream of Iquitos, Peru, forming what countries other than Brazil consider to be the main stem of the Amazon.

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