In terms of length, India shares 3,488 kms of border with China. The Sino-Indian border is generally divided into three sectors namely: The Western sector, The Middle sector, and The Eastern sector.
Sovereignty over two separated pieces of territory has been contested between China and India. One is Aksai Chin, which is located either in the Indian province of Jammu and Kashmir, or the Chinese province of Xinjiang, in the west. It is a virtually uninhabited high-altitude wasteland crossed by the Xinjiang–Tibet Highway. The other disputed territory lies south of the McMahon Line. It was formerly referred to as the North East Frontier Agency, and is now called Arunachal Pradesh. The McMahon Line was part of the 1914 Simla Convention between British India and Tibet, an agreement rejected by China. Lets take a eagle watch..
A. The Western Sector
The Indian boundary with China in the western sector is about 2152 km long. It is between Jammu and Kashmir and Xinjiang (Sinkiang) province of china.
The territorial dispute over Aksai Chin can be traced back to the failure of the British Empire to clearly demarcate a legal border between its Indian colony and China. As two borders between India and China were proposed during the time of the British Raj – the Johnson’s Line and the McDonald Line.
1. The Johnson’s line shows Aksai Chin to be under Indian control whereas the McDonald Line places it under Chinese control. India considers the Johnson Line as the correct, rightful national border with China, while on the other hand, China considers the McDonald Line as the correct border with India.
2. The line that separates Indian-administered areas of Jammu and Kashmir from Aksai Chin is known as the Line of Actual Control (LAC) and is concurrent with the Chinese Aksai Chin claim line.
China and India went to war in 1962 over disputed territory of Aksai Chin. India claimed this was a part of Kashmir, while China claimed it was a part of Xinjiang.
B. The Middle sector
The middle sector boundary is about 625 km long which runs along the watershed from Ladakh to Nepal.The states of Himanchal Pradesh and Uttrakhand touch this border with Tibet (china).
C. The Eastern Sector
The boundary in the eastern sector is 1,140 km long and runs from the eastern limit of Bhutan to a point near the Talu Pass at the trijunction of India, Tibet and Myanmar. This line is called the McMahon Line after Henry Mc Mahon, a British representative who signed the 1913-14 Shimla Convention. The boundary was established along the Himalayan crest of the northern watershed of the Brahmaputra, except where the Lohit, Dihang, Subansiri, and Kemang rivers break through that watershed. China considers the McMahon Line illegal and unacceptable claiming that Tibet had no right to sign the 1914 Convention held in Shimla which delineated the Mc Mahon line on the map.
Talks on the border issue
China and India appointed Special Representatives to discuss the boundary question in 2003. In 2005, he two sides agreed on political parameters and guiding principles for a boundary settlement, which would form the basis of the final settlement. India and China have held 19 rounds (the latest of which was in April 2016 between NSA Ajit Doval and Yang) of Special Representative Talks on the border and there has yet to be an exchange of maps.