Question

Why do you think ancient civilization flourished on river banks?

Answer 1

Fertile soil
Water available for irrigation

Answer 2

Ancient civilization flourished on the banks of river because the man's primary need is food, and it can easily be produced where fertile land is available. People search for lands to get settled and they found banks as favorable for them to flourish.

Not only do river valleys have water, they also often have a wide, flat floodplain readily adapted for farming. Even the earliest, very primitive techniques of farming would have been effective in producing a significant crop in the soil by the banks of the river due to its fertility and properties. Therefore, many civilizations like Harappa or Indus valley started on the river banks.