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The Largest River on Earth

Colombia." - Photo by Chris Lukhaupt

If we take "largest" to mean "longest" then the answer is the Nile river in Egypt, but by sheer volume of water, then the largest river in the world is the Amazon, located in South America.

Xingu

blue The Blue Amazon "Colombia. This place is well known meanwhile and so impressive. Cano Cristales and of course the red water plant that grows there. Macarenia clavigera." - Chris Leukhaup