The longest river in South America, and indeed, the world, is The Amazon. Right behind is the 2nd longest in the world and longest in Africa, The Nile. In third place, worldwide, is Asia's longest river, The Yangtze. The longest in North America is the Missouri River, which is sometimes combined with the lower half of the Mississippi to make it the fourth longest in the world. The Murray River is the 16th longest in the world and the longest in Australia. The longest in Europe and 18th worldwide is the Volga.
And believe it or not, there is a 20 mile river in Antartica called the _Onyx, _it the longest at the bottom of the world.
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