Theory:

Major Harappan sites within Indian borders:
harappan-civilization2.jpg
Kot Diji:
Kot_diji.jpg
Remains of Fort in Kot Diji

The Fort of Ahmadabad is situated in the town of Kot Diji in the Khairpur District of Pakistan, about \(25\) miles east of the Indus River, on the outskirts of the Thar Desert.
Brad Chase discovered a button seal in Kot Diji that had washed into the lane, which was very similar to seals retrieved from Rehman Dheri in the Gomal Valley to the northwest. In \(1957-58\), S.R Rao excavated the site. It's a Harappan site from the post-Harappan era.
Chanudaro:
chanhudaro.png
Remains of Chanhudaro

Chanhudaro is an ancient Indus Valley Civilization archaeological site. The site is \(130\) kilometres south of Mohenjo-Daro in Pakistan's Sindh province. Between \(4000\)-\(1700 BCE\), the settlement inhabited, and it was believed to have been a hub for the manufacture of carnelian beads.
Dholavira:
Dholavira1.jpg
Remains of Dholavira

Dholavira's is one of the five largest Harappan sites in the Indian sub-continent and most prominent archaeological sites in India, which belongs to the Indus Valley Civilization.
Dholavira is located in the Khadir Bet Island in Kutch district of Gujarat. Also known as 'Kotada timba', the site was discovered in 1967 by J P Joshi.
Lothal:
lothal.jpeg
Remains of tank in Lothal

Lothal is well-known for the discovery of Indus Valley Civilization ruins. In the Saurashtra region, Lothal is situated between the Sabarmati river and its tributary Bhogavo. Lothal is \(19\) kilometres from the sea. In the years \(1954\)-\(1963\), archaeologist S.R. Rao and his team discovered many Harappan sites, including the port city of Lothal. Period A and Period B are two sub-periods of Harappan culture, with Period A dated from \(2,400 \)to \(1,900 BCE \)and Period B from \(1,900 \)to \(1,600 \)\(BCE\). The term Lothal, like Mohenjo-Daro, means "mound of dead."
Reference:
https://upload.wikimedia.org/wikipedia/commons/thumb/0/08/Kot_diji.jpg/1024px-Kot_diji.jpg
https://www.discover-pakistan.com/uploads/4/5/9/1/45917479/7320055_orig.png
https://upload.wikimedia.org/wikipedia/commons/1/19/Dholavira1.JPG
http://www.sanskrutitourism.com/wp-content/uploads/2017/08/77_21497676866.jpeg