The benefits are that people lived around the river doing farming and challenges was that pollution increased.
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Vast Empires
The majority of the river civilizations of the ancient times had a King or an Emperor from the Sumer to Assyrian right through the Achaemenide Persian Empire.
Irrigation.
Most river valley civilizations accepted religion of some sort. Unfortunately, however, they also accepted slavery as a standard part of their culture.
Early civilizations were founded in major river valleys.