What Is It That Makes The World Have The Longest Rivers 

The world's longest rivers are usually found in high altitude or mountainous areas. This is because water needs to move uphill against the force of gravity in order to reach lower elevations, from where it can be used to irrigate or drink. Additionally, rivers that flow through fertile terrains tend stay elevated longer than the ones that don't due to their capacity to transport more sediment and nutrients. https://www.freejobalert.com/longest-rivers-in-the-world/994260/