Maarg Manthan · Topic 12.1

Line of Actual Control (LAC) – India-China Border Disputes (Galwan, Doklam, Depsang)

International Relations & Places in News › Border, Territorial and Maritime Disputes in the News · Topic 12.1

The Line of Actual Control, LAC, is the de facto boundary between Indian-controlled and Chinese-controlled territory along their disputed frontier, which India puts at about 3,488 kilometres and China at around 2,000 kilometres. It runs across three sectors: the western sector in Ladakh, the middle sector in Himachal Pradesh and Uttarakhand, and the eastern sector in Sikkim and Arunachal Pradesh. The boundary has never been fully delineated or agreed. Major flashpoints include Depsang, Doklam in 2017 and Galwan, where 20 Indian soldiers died on 15 June 2020. In October 2024 the two sides reached a patrolling arrangement at Depsang and Demchok.

5 min read · UPSC Prelims · International Relations · Border, Territorial and Maritime Disputes in the News

At a Glance

Length (India’s view) About 3,488 km
Sectors Western, middle, eastern
Galwan clash 15 June 2020
Patrolling arrangement October 2024: Depsang and Demchok
Talks Special Representatives and WMCC
Exam link UPSC Prelims, International Relations: Border, Territorial and Maritime Disputes in the News

Where Does It Fit?

This is the first topic of the macro on border, territorial and maritime disputes in the news. The LAC is the most examined border dispute, and the sequence of agreements and clashes is a standard question. Previous topic: Global Terrorism Index. Next topic: Simla Agreement 1972 Endpoint NJ9842; then AGPL to Siachen Ceasefire 2003;…">Line of Control (LoC) – India-Pakistan Border.

What Is the LAC?

Origin: after the 1962 war, the term Line of Actual Control was used by Zhou Enlai in 1959 and 1962 letters, and it became the working boundary. It is not marked on the ground or on agreed maps.
Sectors: the western sector (Ladakh) has Aksai Chin under Chinese control, the middle sector is the least disputed, and the eastern sector includes the McMahon Line of 1914, which China does not accept and which India treats as the boundary of Arunachal Pradesh.
Different perceptions: the two sides hold different views of where the LAC lies in many places, so patrols meet in overlapping areas.
Not the same as the boundary: India claims Aksai Chin, about 38,000 square kilometres in Chinese hands, and China claims most of Arunachal Pradesh, which it calls South Tibet.
Related: Pakistan ceded the Shaksgam Valley of about 5,180 square kilometres to China in 1963, which India says is illegal.

What Agreements and Clashes Mark the Timeline?

Year	Event
1993	Agreement on maintaining peace and tranquillity along the LAC
1996	Agreement on confidence building measures in the military field, banning firing and exercises within two kilometres
2005	Political parameters and guiding principles for settlement of the boundary question
2012 and 2013	Working Mechanism for Consultation and Coordination, WMCC, set up in 2012. Border Defence Cooperation Agreement in 2013 after the Depsang incident
2017	Doklam standoff of 73 days
2020	Clashes in Eastern Ladakh from May and the Galwan violence on 15 June. 20 Indian soldiers died, and China later acknowledged four of its soldiers
2021 to 2022	Disengagement at Pangong Tso, Gogra and Hot Springs, with buffer zones created
October 2024	Patrolling arrangements for Depsang and Demchok announced, and the Prime Minister and President Xi met at Kazan on 23 October 2024
2025 and 2026	Further talks of the Special Representatives, resumed direct flights and Kailash Mansarovar Yatra in 2025, and Prime Minister Modi’s visit to Tianjin for the SCO summit. The latest Special Representatives round was reported in late August 2026 with confidence building steps

What Else Should You Remember About the LAC?

Mechanisms: the WMCC, corps commander talks, the Special Representatives (the National Security Adviser and China’s Foreign Minister) and hotlines.
Buffer zones: temporary no-patrol areas created after disengagement. The 2024 arrangement allowed patrolling and grazing to resume in Depsang and Demchok.
De-escalation: disengagement is followed by de-escalation, which means pulling back troops from the forward areas. Tens of thousands of troops remain deployed on each side.
Infrastructure race: India has built roads, tunnels and bridges such as the Darbuk-Shyok-DBO road and the Atal Tunnel, and China has built villages and roads on its side.
Other flashpoints: Yangtse in Tawang in December 2022 and incidents in Arunachal, including renaming of places by China.

Why Does It Matter and What Are the Debates?

Trust deficit: the 2020 clashes broke the trust built by earlier agreements, and India says normal relations need peace on the border. See mamallapuram-summits-trade-deficit-issues/" class="maargx-auto-link" data-preview="At a Glance Boundary About 3,488 km; LAC not agreed in all sectors Informal summits Wuhan 2018, Mamallapuram 2019 Low point Galwan…">Panchsheel agreement 1954 Asylum Dalai Lama…">India-China Relations: Border Standoffs, Wuhan/Mamallapuram Summits, Trade Deficit Issues.
Normalisation: since 2024 relations have been restored step by step, with flights, pilgrimages and trade steps, but India stays cautious.
Delimitation: the Special Representatives have talked about an early harvest on boundary delimitation, but a final settlement is distant.
Two-front problem: China’s closeness with Pakistan makes the LAC part of a wider security picture.
Water and infrastructure: China’s dam on the Yarlung Tsangpo near the border has added new concerns.

As an analytical point, the LAC remains stable but fragile. India’s approach combines military readiness and infrastructure with dialogue, aiming to restore peace without ceding ground, while managing a large trade relationship.

Why Is This Topic Important?

Facts Sectors and agreements asked
News Disengagement and talks
Link Doklam, Galwan

What Came Next?

The next topic covers the Line of Control with Pakistan. Next topic: Line of Control (LoC) – India-Pakistan Border.

Key People and Terms

LAC Line of Actual Control
WMCC Working Mechanism for Consultation and Coordination
SR talks Special Representatives talks
Disengagement Pulling troops back from face-off points
De-escalation Reducing forces in depth areas
McMahon Line 1914 eastern boundary line

Exam Corner

Points to Remember

About 3,488 km long (India’s figure); three sectors.
Galwan clash: 15 June 2020; 20 Indian soldiers died.
Depsang and Demchok arrangement: October 2024.
Border agreements: 1993, 1996, 2005, 2012, 2013.
McMahon Line is the eastern boundary line.

Do Not Confuse With

LAC and LoC China frontier versus Pakistan ceasefire line
McMahon Line and LAC 1914 boundary claim versus actual control line
Disengagement and de-escalation Face-off points versus wider troop reductions

Memory Hook

Ninety-three, ninety-six, oh-five, oh-twelve, thirteen; twenty Galwan, twenty-four Kazan, patrol the Depsang scene.

Mains Angle

Questions ask about the LAC and the state of India-China ties. These points add depth.

Dispute Perception differences
Progress Disengagement
Limits Trust and de-escalation

A Question You May Face

An original practice question, not a past paper question.

“Discuss the evolution of the India-China border situation since 2020 and the prospects for lasting peace along the LAC.”

How to Answer

LAC Sectors, claims.
2020 Galwan, standoff.
Since 2021 Disengagement, 2024 deal.
Outlook Trust, de-escalation.

GS Relevance

Prelims: sectors, length, flashpoints, agreements. GS Paper 2: India-China relations; GS Paper 3: border security.

Frequently Asked Questions

What is the Line of Actual Control?

The Line of Actual Control is the de facto boundary between Indian and Chinese-controlled territory, about 3,488 kilometres long according to India. It has three sectors, western in Ladakh, middle in Himachal Pradesh and Uttarakhand, and eastern in Sikkim and Arunachal Pradesh, and it has not been fully agreed or marked.

What happened at Galwan in 2020?

On 15 June 2020, a violent clash between Indian and Chinese troops occurred in the Galwan Valley in Ladakh, in which 20 Indian soldiers died. China later acknowledged four of its soldiers had died. It was the deadliest clash on the border in decades and led to a long military standoff.

What was agreed at Depsang and Demchok in 2024?

In October 2024 India and China reached an arrangement on patrolling and grazing at Depsang and Demchok in Eastern Ladakh, which were the last unresolved friction points. It was followed by a meeting between Prime Minister Modi and President Xi Jinping at Kazan on 23 October 2024.

What is the McMahon Line?

The McMahon Line is the boundary drawn at the Simla Convention of 1914 between British India and Tibet in the eastern sector. India treats it as the boundary of Arunachal Pradesh, while China rejects the convention and claims much of Arunachal Pradesh as South Tibet.

What are the main mechanisms for India-China border talks?

The main mechanisms are the Special Representatives talks between India's National Security Adviser and China's Foreign Minister, the Working Mechanism for Consultation and Coordination at the foreign ministry level, corps commander talks between the armies and military hotlines.

PYQ Practice — Statement Analysis

1 The Galwan clash took place in June 2020.

True

On 15 June.

2 The LAC has two sectors.

False

It has three.

3 India and China agreed a patrolling arrangement in October 2024.