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If size is important to you... The average discharge of water into the Atlantic Ocean by the Amazon is approximately 175,000 m3 per second, or between 1/5th and 1/6th of the total discharge into the oceans of all of the world's rivers!
The Amazon River used to flow in the opposite direction. Today, the river flows from the mountains of Peru in the west to the Atlantic Ocean in the east. But millions of years ago, it actually flowed from east to west, emptying into the Pacific Ocean.