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No it is not a modern civilization. It is an ANCIENT civilization!
It's the Harrappan civilization
Harappa was its centre.
The Indus Valley
because scientists do not know much about them
Old
Civilization began in the Harappan or Indus Valley Civilization which flourished during Mesopotamian and Egyptian Civilization. It was situated on the banks of River Indus
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The Indus valley is between Pakistan and India. The Indus river has been a home of civilization since ancient times.
It thrived in the Indus Valley.
indus valley indus valley
The Indus Valley Civilization: Harappa, Mohenjodaro