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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!
From its source to the mouth, the length of the Amazon river is 6,575 km or 4,086 miles. The Amazon originates in the Andes in Peru. The geographic source of the Amazon River in Mt. Nevado Mismi of Peru. From its source to the mouth, the length of the Amazon river is 6,575 km or 4,086 miles. Source: S. Liu, P. Lu, D. Liu, P. Jin, W. Wang, Pinpointing the sources and measuring the lengths of the principal rivers of the world, International Journal of Digital Earth, Volume 2, Issue 1 March 2009 , pages 80 - 87,DOI: 10.1080/1753894090274608