Archive · 13 Aug 2026
Assam-Arunachal border dispute tensions persist despite 2023 pact
Assam and Arunachal Pradesh are two neighboring states in the northeastern part of India.
They disagree about where the border, or boundary line, between them should be.
The argument began long ago, when the British ruled India and drew lines on maps.
Many people in Arunachal Pradesh believe hillside land that belonged to their tribal communities was given to Assam unfairly.
In 2023, the Chief Ministers of both states signed an agreement to try to solve the problem.
Even after signing the agreement, disagreements continue over some villages and pieces of land.
The conflict has occasionally turned into violence, and one person died in a clash in June 2023.
The leaders say they still want peace and prefer to solve their differences by talking instead of fighting.
Assam and Arunachal Pradesh share an approximately 804-km boundary with around 1,200 disputed points and 123 villages identified as disputed by Arunachal Pradesh in 2007.
The dispute traces to British colonial rule, including the 1873 Inner Line Regulation, and the 1951 Bordoloi sub-committee recommendations that shifted around 3,648 sq km to Assam.
Chief Ministers Himanta Biswa Sarma and Pema Khandu signed a landmark MoU in New Delhi on April 20, 2023, before Union Home Minister Amit Shah, agreeing to settle the 123-village dispute with no fresh claims.
Tensions persist: Assam alleges encroachment on more than 16,144 hectares, Arunachal Pradesh claims 858.91 sq km, and a Dhemaji clash in June 2023 left one person dead and another injured.
Sarma says only 52 disputed areas remain across five sectors and has urged an inquiry into the recent incident, while Khandu has pledged to resolve differences through dialogue and peace.
- Who
- Assam Chief Minister Himanta Biswa Sarma and Arunachal Pradesh Chief Minister Pema Khandu, with Union Home Minister Amit Shah present at the 2023 MoU signing.
- What
- A decades-old inter-state boundary dispute over 123 disputed villages along the Assam-Arunachal Pradesh border that persists despite the 2023 settlement pact.
- When
- Rooted in British-era demarcation beginning in 1873; the landmark MoU was signed on April 20, 2023, and fresh tensions continued into July 2026.
- Where
- Along the approximately 804-km shared border between Assam and Arunachal Pradesh in northeastern India, including areas such as Dhemaji.
- Why
- Arunachal Pradesh contends colonial-era demarcation placed forested foothill areas tied to tribal communities under Assam without adequate consultation, while ground-level demarcation disagreements continue.
Assam's position
Arunachal Pradesh's position
Land claims
Assam's position
Assam told its assembly in July 2026 that Arunachal Pradesh had allegedly encroached on more than 16,144 hectares of Assamese land.
Arunachal Pradesh's position
Arunachal Pradesh separately claims 858.91 sq km as its own, arguing forested foothill areas historically tied to hill tribal communities were brought under Assam's administration.
Ground-level demarcation after the 2023 MoU
Assam's position
Sarma says most boundary issues have been resolved and only 52 disputed areas remain across five sectors, with reconstituted regional committees working on the outstanding issues.
Arunachal Pradesh's position
Local communities have objected to aspects of the settlement, arguing ground-level concerns were not adequately reflected in the negotiations.
Colonial-era demarcation and consultation
Assam's position
Assam's administration reflects the 1951 Bordoloi committee arrangements that transferred around 3,648 sq km of foothill areas to Assam.
Arunachal Pradesh's position
Arunachal Pradesh questioned the demarcation as drawn without adequate consultation with tribal hill communities and has sought restoration of areas it believes historically belonged to them.
- Shared boundary length
- Approximately 804 km
- Disputed villages
- 123, identified by Arunachal Pradesh in 2007
- Landmark agreement
- MoU signed April 20, 2023, in New Delhi by both Chief Ministers
- Namsai Declaration
- 2022 agreement to examine disputed villages through 12 regional committees
- Land transferred to Assam (1951)
- Around 3,648 sq km
- Assam's allegation
- Arunachal Pradesh allegedly encroached on more than 16,144 hectares
- Arunachal Pradesh's claim
- 858.91 sq km of land
- Remaining disputed areas
- 52 across five sectors, per Sarma