Line of Actual Control (LAC)

The Line of Actual Control, or LAC, is the line that separates the areas held by India from the areas held by China. It is not a border that both countries have agreed on and marked on the ground. It simply shows where each side's control actually stops today. India and China have different ideas about where this line runs, and that gap is the root of most face-offs between their soldiers.

Why is there no agreed border?

A proper international border is fixed by a treaty, drawn on agreed maps and then marked on the ground with pillars. India and China never completed these steps. The British rulers of India and the rulers of Tibet and China drew different lines at different times, and newly independent India and the new Chinese state (from 1949) did not accept each other's claims. So instead of a border, both sides have a "line of control" that reflects only where each army stands.

Where did the term come from?

China's Premier Zhou Enlai used the idea in a letter to Prime Minister Jawaharlal Nehru dated 7 November 1959. He proposed that both sides pull back 20 km from the "McMahon Line" in the east and from "the line up to which each side exercises actual control in the west". Nehru rejected this proposal in his reply of 16 November 1959.

After the 1962 war, the term was used mainly for the western sector. In the 1990s it came to mean the whole India-China frontier. The 1993 India-China agreement on peace along the LAC made the term official, but it did not say where exactly the line runs.

How long is it and how is it divided?

India treats the LAC as about 3,488 km long. China's figure is much shorter, around 2,000 km, because China counts only the eastern part and not the western part in the same way. The LAC is divided into three sectors:

• Western sector: Ladakh. This is where most disputes lie, including Aksai Chin.
• Middle (central) sector: Himachal Pradesh and Uttarakhand. This is the least disputed part.
• Eastern sector: Sikkim and Arunachal Pradesh. Here the line broadly follows the McMahon Line.

What does each side claim?

In the west, China holds about 38,000 sq km of land in Aksai Chin that India says belongs to the Union Territory of Ladakh. In addition, under a 1963 agreement between China and Pakistan, Pakistan handed over about 5,180 sq km of the Shaksgam Valley to China. India says this land is Indian territory illegally held by Pakistan, so it never accepted that agreement.

In the east, China claims about 90,000 sq km, which is almost the whole of Arunachal Pradesh. China calls this area "Zangnan" (South Tibet). It has issued its own Chinese names for places there five times: 6 names in 2017, 15 in 2021, 11 in 2023, 30 in 2024 and 27 in May 2025. India rejects every such list.

What is the McMahon Line?

It was drawn at the Simla Conference of 1913-14 between British India, Tibet and China. It is named after Sir Henry McMahon, the British official who led the talks. Britain and Tibet accepted the line, but China did not sign the final agreement. India treats the McMahon Line as the boundary in the east. China says it is illegal because Tibet had no right to sign treaties.

What are "friction points" and "patrolling points"?

Since the line is not marked, each side has its own idea of it. In some places the two ideas overlap, and both armies send patrols into the same strip of land. These are friction points. Indian patrols go up to fixed spots called patrolling points (PPs), which show how far India's claim goes. In eastern Ladakh, well-known friction points include:

• Galwan Valley (around PP14)
• Pangong Tso, a long lake, on its north bank (the "Fingers" area) and south bank
• Gogra (PP17A) and Hot Springs (PP15)
• Depsang Plains and Demchok

What happened in 2020 and after?

In April-May 2020, Chinese troops moved in large numbers to several points in eastern Ladakh. On 15 June 2020, a violent clash took place in the Galwan Valley. India lost 20 soldiers. In February 2021, China admitted that 4 of its soldiers died. These were the first deaths on the border since 20 October 1975, when 4 Assam Rifles soldiers were killed at Tulung La in Arunachal Pradesh. After many rounds of military and diplomatic talks, the two sides pulled back troops step by step:

1. Pangong Tso north and south banks: February 2021
2. Gogra (PP17A): August 2021
3. Gogra-Hot Springs (PP15): September 2022
4. Depsang and Demchok: agreement of 21 October 2024, under which patrolling and grazing returned to the earlier pattern

At some points (Galwan, Pangong Tso, Gogra-Hot Springs), the pullback created "buffer zones". These are strips where neither side patrols for now, to keep soldiers apart.

Who guards the LAC?

The Indo-Tibetan Border Police (ITBP), a Central Armed Police Force under the Ministry of Home Affairs, guards the LAC in peacetime. The Indian Army is also deployed in large numbers, especially since 2020. This is different from the border with Pakistan, which is guarded by the Border Security Force (BSF), and the Line of Control, which is held by the Army.

India's position and Indian examples

India's stated position is that peace and tranquillity in border areas are the base of the whole relationship, and that the LAC must be strictly respected until a final boundary settlement. India has been building roads, bridges, tunnels and airstrips near the LAC to match China's infrastructure. Examples include the Darbuk-Shyok-Daulat Beg Oldi road in Ladakh and the Sela Tunnel in Arunachal Pradesh.

Under the Vibrant Villages Programme, India is also developing villages along the northern border so that people do not move away from these areas.

Commonly confused concepts

• LAC vs LoC (Line of Control): The LAC separates India and China. The LoC separates the parts of Jammu and Kashmir held by India and by Pakistan. The LoC came from the 1949 Karachi ceasefire line and was renamed the Line of Control under the Simla Agreement of 1972. The LoC (about 740 km) is drawn on a map signed by both armies. The LAC is not even agreed on a map.
• LAC vs International Border (IB): An International Border is legally agreed and marked on the ground, like most of the India-Pakistan border from Gujarat to Jammu. Neither the LAC nor the LoC is an International Border.
• LAC vs AGPL (Actual Ground Position Line): The AGPL is the line between Indian and Pakistani troops on the Siachen Glacier, beyond the end of the LoC at map point NJ9842. It is not related to China.
• McMahon Line vs LAC: The McMahon Line is a 1914 line that India treats as the boundary in the east. The LAC is the line of present control across all three sectors. In the east they are broadly similar, but not the same at every point.
• Shimla Agreement 1972 vs Simla Convention 1914: The 1972 Simla (Shimla) Agreement is between India and Pakistan and created the LoC. The 1913-14 Simla Convention produced the McMahon Line with Tibet.

Issues, criticism and the way forward

• No agreed map: Because the two sides have never exchanged maps of the LAC in the western sector, patrols keep running into each other. An exchange of maps took place only for the middle sector, in 2002.
• Buffer zones: Critics point out that buffer zones mean Indian patrols can no longer reach some points they earlier visited. The government's position is that these are temporary steps to prevent clashes.
• Infrastructure gap: China built roads and military bases near the LAC much earlier. India is catching up, but terrain and weather make work slow.
• Map and naming contests: Both sides use maps and place names to show their claims, as seen in China's renaming of places in Arunachal Pradesh and India's naming of places in Ladakh. The Ministry of Home Affairs added standard Indian names for 27 places in Arunachal Pradesh (August 2026) and 28 places in Ladakh (October 2026) to Survey of India maps. China called both lists illegal, and India rejected China's objection.
• Way forward: Experts suggest clarifying the LAC through map exchange, keeping regular military talks at all levels, and building trust step by step while protecting India's claims through stronger presence on the ground.

Concepts to Know

• Aksai Chin: A high, cold, mostly empty plateau in the north-east of Ladakh. China built a highway through it in the 1950s linking Tibet and Xinjiang, and it has held the area since.
• De facto vs de jure: De facto means "in practice", what is actually happening on the ground. De jure means "by law", what is legally agreed. The LAC is a de facto line, not a de jure border.
• Disengagement: Soldiers of both sides who are standing face to face move back from the spot of the face-off. It is the first step to reduce tension.
• De-escalation: The bigger next step after disengagement, in which both sides reduce the extra troops and weapons they brought to the area.
• Survey of India: India's national mapping agency, under the Department of Science and Technology, set up in 1767. Its maps are India's official maps.