Early civilizations were located on rivers because rivers contain fresh water needed by humans as an essential of life and for washing. Further, transportation for any long distance was so much easier on boats or rafts than by foot or on horseback or wagon. Generally, the soil in the vicinity of a river is better suited to agriculture than at higher elevations because rich topsoil tends to erode downhill toward the river bed, and the water from the river is more easily available to the farm animals.
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Early civilizations emerged in river valleys and areas with water because in this time (Neolithic Era) people would require it for agricultural purposes. Growing crops and having fertile lands for which to grow crops on.
Many landforms, such as mountains or rivers were uncrossable to early civilizations, so they stayed where they were, away from other groups
Bodies of water, rivers, lakes. Essential for agriculture, food source, human life, transportation,
rivers
In order for early civilizations to develope they needed a good source of water. With water they could irrigate their crops and improve travel. If they did not have a solid source of water to develop farming early civilizations like the Egyptians(Nile River), Mesopotamians (Tigrus and Euphrates Rivers), or Indus river civilizations would not have survived.
Vast Empires