What is the world's longest river?

The Nile is now considered the longest river in the world. At one time, the Para River was considered to be part of the Amazon's mouth, so when added to the length of the Amazon, its distance exceeded that of the Nile. Most geographers now agree that the opposite is true, that the true mouth is on the north side of the Island of Marajo, where it flows straight through the Canal de Norte and out into the Atlantic.

Nile River: 4,238 miles (6,825 kilometers)
Amazon River: 4,000 miles (6,437 kilometers)
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