Theory:

Major Harappan sites within Indian borders:
harappan-civilization1.jpg
Harappan sites on the map
 
Harappa:
harappa.jpg
Harappan towns
 
The Harappan civilization, or Indus Valley Civilization, was the first to establish an accurate system of standardized weights and measures. Terracotta, bronze, and stone were used to produce sculpture, seals, pottery, and jewellery by the Harappans.
 
Mohenjo-Daro:
Mohenjodaro.jpg
Remains of Mohenjo-Daro
 
The city of Mohenjo-Daro was the most established, with impressive urban planning. When the Indus civilization fell into disarray around \(1900 BCE\), this site was abandoned. The name Mohenjo-Daro is derived from the expression "the mound of the dead." The significance of this site was first recognized in \(1922\), one year after Harappa was discovered. Following excavations, it was discovered that the mounds contain the ruins of the Indus civilization's largest settlement.
 
Banawali:
banawali.jpg
Brick well found at Banawali
 
The civilization that existed in Banawali between \(2600\) and \(1700 BCE \)was known as Early Harappan. Dr R.S. Bisht, a member of India's Archaeological Survey, excavated the site and discovered three distinct cultures: Pre-Harappan, Harappan, and Post-Harappan.
 
Rakhigarhi:
Rakhigarhi.jpg
Remains of ruins in Rakhigarhi
 
Rakhigarhi's beauty has drawn the attention of archaeologists from all over the world. It's closer to present Delhi, North India. Most of the field remains unexplored and unpublished.
From \(1997\) to \(2000\), Amarendra Nath, the Superindent Archaeologist, excavated the Rakhigarhi site. The root of the Harappan civilization's history, according to Dr Shinde, was a big question.
Reference:
https://image.slidesharecdn.com/historyppt1-141111140144-conversion-gate02/95/harappan-civilization-4-638.jpg?cb=1415714618
http://cdn.sci-news.com/images/2019/09/image_7575-Harappan-Civilization.jpg
https://upload.wikimedia.org/wikipedia/commons/thumb/0/03/Mohenjodaro_-_view_of_the_stupa_mound.JPG/800px-Mohenjodaro_-_view_of_the_stupa_mound.JPG
https://cdn.s3waas.gov.in/s36cdd60ea0045eb7a6ec44c54d29ed402/uploads/bfi_thumb/2018022768-olw9gxm5j5brytd7xadsudbnue0xdhna493f95rdl6.jpg
https://assets.telegraphindia.com/telegraph/1dc81c21-0a01-4ab0-a412-d3263260da7b.jpg