What is the disputed territory of southern Tibet between China and India?

Southern Tibet: If you open Baidu map, the area in the southeast corner of Tibet, west of Chayu County, south of Cuona County, Zi Long County, Milin County and Motuo County, which is not marked with counties and cities, is southern Tibet. India calls it Arunachal Pradesh, which is actually controlled by India.

India's actual line of control in southern Tibet was the McMahon line drawn by Britain in the19th century. At that time, India was a British colony, and Britain allocated that part of the land to India for its own benefit.

Later, the Qing government and the Republic of China government had very weak control over Tibet and did not recover this part of the territory. At the same time, India launched a large-scale immigration activity to southern Tibet in the 20th century. Now there are more Indian residents in southern Tibet than Tibetans, so it is very difficult to drive them away.

China did not take this route when it invaded India. After attacking Delhi, the leaders ordered the withdrawal of troops for various reasons, and did not put forward the conditions for the withdrawal and merger of southern Tibet.