China: the Himalayan boundary

Detail

India and its largest neighbour

• India and China have had a long, strategic relationship since 1950.
• Size: China is about three times India's area (NCERT Class 7, Fig. 2.3).
• The border: the Himalayas separate the two countries. The boundary is about 3,488 km long.
• Indian states and UTs on the border, from east to west:

• Arunachal Pradesh → Sikkim → Uttarakhand → Himachal Pradesh → Ladakh (UT)

• Bhutan and Nepal lie between India and China along parts of the Himalaya. So the India-China border is not one continuous line. It is broken into separate stretches.

• Most tensions between the two countries are about the border.

Trade (2024-25)

• India's exports to China (2024-25): iron ore, chemicals, cotton yarn. These are mostly raw materials and low-value goods.
• India's imports from China (2024-25): electronics, machinery. These are high-value manufactured goods.
• The imbalance: China's exports to India are about eight times India's exports to China (2024-25). This gives India a very large trade deficit (trade deficit: when a country buys much more from another country than it sells to it).

Key terms

• Line of Actual Control (LAC): the de facto line (de facto: the line each side actually holds on the ground, not a legally agreed border). The two sides have never jointly marked it on maps or on the ground, so each side has its own idea of where it runs. This gap is the main cause of face-offs.
• McMahon Line: the boundary in the eastern sector. It was drawn at the Simla Convention (1914) along the crest of the eastern Himalaya (crest: the highest ridge line, which is also the line where water divides between the two sides).
• It was negotiated between Tibet and British India at the end of the Shimla Conference (October 1913 – July 1914). It is named after the chief British negotiator, Sir Henry McMahon [2].
• Extent: it runs from the eastern border of Bhutan along the crest of the Himalaya to the great bend of the Brahmaputra, where the river leaves Tibet (as the Tsangpo) and enters the Assam valley [2].
• China's position: Chinese delegates attended the conference but refused to sign the main agreement. They argued that Tibet was under China and had no power to sign treaties [2]. China still rejects the line today.

The boundary in three sectors

Sector	Indian state/UT	Main dispute	Status
Western	Ladakh	Aksai Chin (about 38,000 sq km); Shaksgam valley (about 5,180 sq km)	Held by China; claimed by India
Middle	Himachal Pradesh, Uttarakhand	Small pockets, e.g. Barahoti (Uttarakhand)	Least disputed sector
Eastern	Sikkim, Arunachal Pradesh	McMahon Line; China claims all of Arunachal as "Zangnan"	Held by India; claimed by China

Western sector (Ladakh)

• Aksai Chin: a high cold desert of about 38,000 sq km in the east of Ladakh (cold desert: a very dry area where it is cold because of the height, so there is little rain or snow and very few plants).
• India claims it. China has held it since the 1950s.

• Why China wants it:

  • In the 1950s China built the Xinjiang-Tibet road (G219) through Aksai Chin.
  • The road links Xinjiang with Tibet. It is China's key land route to western Tibet.
  • So Aksai Chin matters to China as a transport corridor, not for its people or resources.

• Shaksgam valley: about 5,180 sq km, north of the Karakoram range.

• Pakistan ceded (handed over) it to China in the Sino-Pakistan Boundary Agreement, 1963.
• India rejects this transfer. India's view: the area belongs to Jammu and Kashmir, so Pakistan had no right to give it away.

Middle sector (Himachal Pradesh, Uttarakhand)

• This is the least disputed sector.
• Barahoti (Uttarakhand) is one of the few points the two sides disagree on.

Eastern sector (Sikkim, Arunachal Pradesh)

• The boundary follows the McMahon Line (1914).
• China rejects the McMahon Line. It claims Arunachal Pradesh as "Zangnan" ("South Tibet").
• China keeps "renaming" places in Arunachal Pradesh by giving them Chinese names. India rejects this. India's position is that Arunachal Pradesh is an integral part of India, and names given by China do not change that fact.

Flashpoints as places

A flashpoint is a place where tension can quickly turn into a clash.

Galwan valley (Ladakh, western sector)

• The Galwan river is a tributary of the Shyok (tributary: a smaller river that joins a bigger one). The Shyok in turn joins the Indus.
• 15 June 2020: a clash in the Galwan valley killed 20 Indian soldiers. It was the first deadly clash on the LAC in decades.

Other eastern Ladakh friction points (2020-2024)

• Pangong Tso: a long, high-altitude lake. The LAC cuts across it, so part of it is held by India and part by China.
• Gogra-Hot Springs
• Depsang (plains in northern Ladakh)
• Demchok (southern Ladakh, near the Indus)
• Disengagement (troops of both sides pull back from face-to-face positions) happened step by step. The last agreements, covering Depsang and Demchok, came in October 2024.

Earlier flashpoints (in time order)

Year	Place	State/area	What happened
1962	Western and eastern sectors	Ladakh; NEFA (now Arunachal Pradesh)	India-China war
1967	Nathu La	Sikkim	Border clashes at the pass
1986-87	Sumdorong Chu	Arunachal Pradesh (Tawang area)	Military stand-off
2017	Doklam	India-Bhutan-China trijunction, near Sikkim	73-day stand-off over Chinese road building (see Section 4)
2020	Galwan	Ladakh	Deadly clash; 20 Indian soldiers killed

Mount Kailash, Lake Mansarovar and the rivers

• Mount Kailash (about 6,638 m) is in Tibet (China). Lake Mansarovar lies near it.
• They are sacred to four faiths: Hindus, Buddhists, Jains and Bon (Bon: the old native religion of Tibet).
• Kailash Mansarovar Yatra (the official pilgrimage from India) uses two routes:
• Lipulekh pass (Uttarakhand)

• Nathu La pass (Sikkim)

• The yatra was paused after 2020. It resumed in 2025.

• Rivers that rise near Kailash-Mansarovar:

River	Rises in	Enters India in	Note
Indus	Tibet, near Mansarovar	Ladakh	Flows north-west through Ladakh into Pakistan
Satluj	Tibet, near Mansarovar (Rakas Tal area)	Himachal Pradesh, via Shipki La	Tributary of the Indus system
Brahmaputra (called Tsangpo in Tibet)	Tibet, near Mansarovar	Arunachal Pradesh, after the great bend	Called Siang/Dihang in Arunachal

• Why this matters:
• China is upstream of India on all three rivers (upstream: nearer the source, so it controls the water before it reaches India).
• So dams or water diversion in Tibet can affect river flow, floods and water supply downstream in India.
• (Link: india-drainage-rivers)

Ancient cultural links (NCERT Class 7)

• Buddhism reached China around the 1st century CE.
• Chinese scholars who came to India to study:
• Faxian (Fa-Hien)
• Xuanzang (Hiuen Tsang)

• They studied at Indian centres of learning.

• Indian monks who went to China:

• Bodhidharma
• Dharmakshema
• Kumarajiva

• They helped spread and translate Buddhist texts.

• Quanzhou (a port in south-east China): in the 13th century, Hindu merchants built temples here. Carvings of Vishnu and Shiva survive at the Kaiyuan temple. This shows that Indian traders were active along the sea routes to China.

Prelims Hooks

• Order of Indian states/UTs on the China border, east to west: Arunachal Pradesh → Sikkim → Uttarakhand → Himachal Pradesh → Ladakh.
• LAC sectors: Western = Ladakh; Middle = Himachal Pradesh and Uttarakhand (least disputed; Barahoti); Eastern = Sikkim and Arunachal Pradesh.
• McMahon Line: drawn at the Simla Convention, 1914. It runs from the eastern border of Bhutan to the great bend of the Brahmaputra. China never signed it [2].
• Aksai Chin (about 38,000 sq km, Ladakh) is held by China. The G219 Xinjiang-Tibet road runs through it.
• Shaksgam valley (about 5,180 sq km), north of the Karakoram, was ceded by Pakistan to China in 1963. India rejects the transfer.
• Galwan river → Shyok → Indus. Clash on 15 June 2020; 20 Indian soldiers died.
• Pass and state pairs on the Kailash Mansarovar Yatra routes: Lipulekh – Uttarakhand; Nathu La – Sikkim.
• Mount Kailash (about 6,638 m) is sacred to Hindus, Buddhists, Jains and Bon. The Indus, Satluj and Brahmaputra rise nearby.
• Trap: "Zangnan" is China's name for Arunachal Pradesh. It is not a place in Ladakh.
• Monk direction trap: Faxian and Xuanzang came China → India. Bodhidharma, Dharmakshema and Kumarajiva went India → China.

Mains Points

• Why the boundary stays disputed (GS-I):
• The colonial-era lines were never accepted by both sides. China refused to sign the McMahon Line (1914) [2], and the western sector was never clearly defined.
• The LAC has never been jointly marked, so patrols of both sides keep overlapping. This led to clashes at Galwan (2020) and stand-offs at Depsang and Demchok, which were settled only in 2024.

• Strategic geography makes both sides hold firm. For China, Aksai Chin carries the G219 link between Xinjiang and Tibet. For India, the Shaksgam valley (1963 cession) brings China closer to the Karakoram and Siachen.

• Upstream control of rivers (GS-I/GS-III):

• The Indus, Satluj and Brahmaputra rise in Tibet, so China is the upper riparian state (the country nearer the source of a shared river).
• This raises concerns over flood warnings, river-flow data and dam building for Ladakh, Himachal Pradesh, Arunachal Pradesh and Assam.

• India needs data-sharing arrangements and stronger flood preparedness in these states.

• Border infrastructure and connectivity (GS-III):

• Roads, passes and pilgrim routes in high, cold and landslide-prone terrain (Lipulekh, Nathu La, Ladakh) are hard to keep open in all seasons.

• Border roads serve both defence and local development in thinly populated Himalayan areas.

• Trade imbalance (GS-III):

• In 2024-25, India sent China raw materials (iron ore, cotton yarn, chemicals) and bought electronics and machinery. China's exports to India were about eight times India's exports to China.

• This shows that India needs more domestic manufacturing, especially in electronics.

• Soft power: Buddhism (1st century CE), the travels of scholars and monks, the Quanzhou temples and the Kailash Mansarovar Yatra (resumed 2025) are a cultural base for confidence-building between the two countries.