FOR the past 100 years, the Amazon and Nile rivers have been vying with each other to be the world's longest river.
The exact length of the two rivers varies over time and scientists disagree as to their actual length.
The Nile River is considered to be between 5499km and 6690km long. But whichever river is longer, the Amazon River carries the greater volume of water. -
sciencekids.co.nz; wikipedia.org; extremescience.com