Famous Rivers in the World
Next only perhaps to the mountains, famous rivers in the world are the natural phenomena which contributed the most in the development of human civilizations. Containing mostly fresh water, rivers are the natural waterways flowing from higher altitudes towards the lower altitudes or from mountains to the sea. In many cases, however, the river dries up or is absorbed before reaching another body of water or the sea. The opposite direction of the flow of a river is termed as “up river” and towards the flow is called the “down river” direction. The study of rivers is a regular science now and is known as potamology. “River flow” is defined as the volume of water passing through a predetermined cross section of a river in a unit of time. It is usually measured in cubic meters per second. Not all the rivers are permanent; some are only temporary and flow only during high rainfall. Rivers are classified differently and according to one system devised by William Morris Avis, they are class...