Measuring river lengths is not a simple procedure as it includes a number of variables and changeable definitions. Deciding where the river's true source is key, as is deciding which tributary is furthest away from the river's mouth. So here are the world's 5 longest river systems with the number 1 decided by the judges at Guinness World Records!

8 Facts About Amazon River

Here are some most amazing facts about the Amazon river that will blow your mind. But is it the longest...

Dan the Info-man
The Amazon flows into the Atlantic Ocean.
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