Theory:

Major Harappan sites within Indian borders:
harappan-civilization3.jpg
Balakot:
balakot.jpg
Remains of Balakot

Balakot is one of the four known ancient coastal sites in Pakistan dating to South Asia's earliest civilization, the Harappan or Indus civilization that flourished in the centuries before and after \(2000 BCE\). 
Kalibangan:
kalibangan.jpg
A well planned brick structures-Kalibangan

Kalibangan was discovered by Luigi Pio Tessitori, an Italian Indologist and linguist. He deciphered inscriptions, sculptures, pottery, coins and seals in that Pilibangan Area at the border of Hanumangarh and Suratgarh and, thus, a great Indus Valley Civilization, Kalibangan, was discovered.
Luigi Pio Tessitori discovered this site after the nation achieved independence in \(1952\). He was an Indologist and linguist from Italy. Amlanand Ghosh, an archaeologist from India, identified the site as part of the Harappan Civilization and designated it for excavation. B. B. Lal and Balkrishna Thapar excavated the site later, between \(1961\) and \(1969\).
Nageswara:
nageswar.jpg
Exposed Nageswara

The discovery of Nageswara on the Gulf of Kutch's southern coast in Gujarat has revealed new details about Harappan expansion in this region. Nageswara is situated on the edge of the Bhimgaja Talao freshwater reservoir, connected to the ancient Saivite temple of Nageswara. This temple is about \(17\) kilometres northeast. Since the excavators were only interested in removing the soft organic soil for dam construction, large piles of potsherds, shell fragments, grinding stones, and stone foundations remained in place. This one-of-a-kind situation has allowed important architectural features and the distribution of shell manufacturing waste to be observed in their original contexts.
Reference:
http://seshatdatabank.info/wp-content/uploads/2017/01/cp1-768x436.jpg
https://ohmyrajasthan.com/uploads/18/1495186519ohmyrajasthan-KalibanganMuseum3-sst.jpg
https://menglish.sakshi.com/sites/default/files/styles/cinema_main/public/article_images/2020/06/17/temple-1592399924.jpg?itok=Dokl4B7i