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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 basin is the largest drainage basin in the world, about 7,050,000 square kilometres (2,720,000 sq mi), and accounts for approximately one-fifth of the world's total river flow.n its upper stretches, above its confluence with the Rio Negro, the Amazon is called Solimoes solimÃµes In. Brazil but In, Peru colombia And, ecuador as well as the rest of The-spanish speaking, world the river is generally called The amazon downstream beginning at the confluence of The maranon MaraÃ±Ã³n and ucayali Rivers. in peru