A couple paragraphs on the importance of rivers in early civilizations.
Rivers offer fish for food, a transportation route, but most of all, rivers make fertile soil. In early civilizations around 3,000 B.C. all ancient cities were located on rivers for great farming which made non-nomadic life possible. Rivers were the main component that made civilizations expand.
In Mesopotamia, the first civilizations, around 3,000 B.C. the Sumerians, Assyrians, and the Akkadians all turned down their nomadic life style for settlement. The key reason that these nomadic tribes could stay in one location was because of the benefits provided by the rivers they chose to dwell near. For example, the Tigris and Euphrates rivers overflow due to the melting of snow on mountains. When they would do so, the rivers would deposit fertile silt, making farmers able to farm the land. Once an abundant flow of crops could be made, there was no reason for the tribes migrate. They now could begin building civilizations and progress in technology. These discoveries confirm that because of rivers, civilizations had the capability to develop.