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Explained: At the root of Assam-Arunachal Pradesh border dispute, a committee report from 1951

Arunachal Pradesh, which was earlier a part of Assam, shares a boundary of roughly 800 km with the state—with frequent flare-ups reported along the border since the 1990s.

Written by Tora Agarwala | Guhawati |
Updated: February 3, 2022 1:02:44 am
Between 1971 and 1974, there were multiple efforts to demarcate the boundary but it did not work out.

Last month, just days after Assam chief minister Himanta Biswa Sarma met with his Arunachal Pradesh counterpart, Pema Khandu, to discuss a solution to the decades-old boundary dispute between the two states, fresh tensions were reported along the border. While the flashpoint this time was the ongoing construction of the Likabali-Durpai road being built under the Pradhan Mantri Gram Sadak Yojana (PMGSY), the boundary dispute between Assam and Arunachal Pradesh dates back to colonial times.

Bone of contention: 1951

Arunachal Pradesh, which was earlier a part of Assam, shares a boundary of roughly 800 km with the state—with frequent flare-ups reported along the border since the 1990s.

The dispute dates back to colonial times, when the British in 1873 announced the “inner line” regulation, demarcating an imaginary boundary between plains and the frontier hills, which were later designated as the North East Frontier Tracts in 1915. The latter corresponds to the area that makes up present-day Arunachal Pradesh.

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A part of the Durpai-Likabali road, near Hime village.

After Independence, the Assam government assumed administrative jurisdiction over the North East Frontier Tracts, which later became the North East Frontier Agency (NEFA) in 1954, and finally, the Union Territory (UT) of Arunachal Pradesh in 1972. It gained statehood in 1987.

However, before it was carved out of Assam, a sub-committee headed by then Assam chief minister Gopinath Bordoloi made some recommendations in relation to the administration of NEFA (under Assam) and submitted a report in 1951. Based on the Bordoloi committee report, around 3,648 sq km of the “plain” area of Balipara and Sadiya foothills was transferred from Arunachal Pradesh (then NEFA) to Assam’s then Darrang and Lakhimpur districts.

“This remains the bone of contention between the two states as Arunachal Pradesh refuses to accept this notification as the basis of demarcation,” said a senior government official from Assam, closely involved in inter-state border-related matters.

Arunachal Pradesh has long held that the transfer was done without the consultation of its people. “It was arbitrary, defective, and no tribal leader from Arunachal Pradesh was consulted before the land was transferred. They just decided to draw a line between the hills and plains,” said Tabom Dai, General Secretary, All Arunachal Pradesh Students’ Union (AAPSU). According to him, Arunachal had customary rights over these lands, considering the tribes living there would pay taxes to Ahom rulers. Assam, on the other hand, feels that this demarcation as per 1951 notification is constitutional and legal.

Efforts at demarcation


The border issues came to the fore after Arunachal Pradesh became a UT in 1972. Between 1971 and 1974, there were multiple efforts to demarcate the boundary but it did not work out. In April 1979, a high-powered tripartite committee was constituted to delineate the boundary on the basis of Survey of India maps, as well as discussions with both sides.

By 1983-84, out of the 800 km, 489 km, mostly in the north bank of the Brahmaputra, were demarcated. However, further demarcation could not commence because Arunachal Pradesh did not accept the recommendations, and claimed several kilometres out of the 3,648 sq km that was transferred as per the 1951 notification.

Assam objected and filed a case in the Supreme Court in 1989, highlighting an “encroachment” made by Arunachal Pradesh.


To resolve the dispute between the two states, the apex court-appointed a local boundary commission in 2006, headed by a retired SC judge. In September 2014, the local commission submitted its report. Several recommendations were made (some of which suggested Arunachal Pradesh get back some of the territory which was transferred in 1951), and it was suggested that both states should arrive at a consensus through discussions. However, nothing came of it.


According to a 2008 research paper from the Manohar Parrikar Institute for Defence Studies and Analyses, clashes were first reported in 1992 when the Arunachal Pradesh state government alleged that people from Assam were “building houses, markets and even police stations on its territory”. Since then intermittent clashes have been taking place, making the border tense. Another paper by the same institute in 2020 said that Assam had raised the issue of Arunachal Pradesh encroaching on its forest land, and had periodically launched eviction drives, leading to tensions on the ground. One was in 2005 in Bhalukpong in Arunachal Pradesh’s West Kameng district and the other in 2014 in the Behali Reserve Forest area, in the foothills between Assam’s Sonitpur and Arunachal’s Papumpare districts. Ten people died in the Behali incident.

The recent flashpoint is the ongoing Likabali-Durpai PMGSY road project in Arunachal Pradesh’s Lower Siang district—Assam claims that some parts of the road, under construction since 2019, falls under its Dhemaji district.

The road, about 65 km to 70 km, is meant to connect at least 24 villages between Arunachal Pradesh’s Durpai and Likabali and has been granted after years of petitioning by local residents. Likabali is one of the oldest towns in the foothills and has long been a site of dispute.

Last week, a culvert under construction close to Hime, one of the villages through which the road runs, was burnt by “unidentified miscreants from the Assam side”, authorities said. Following that, there were unconfirmed reports of “firing in the air” by local residents from the Arunachal Pradesh side on Wednesday night. This was preceded by a team from Assam Police stopping the construction in Hime, claiming that the road was touching disputed territory.


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Authorities from both sides say this was not the first instance of trouble along the road and that it keeps happening occasionally ever since construction started two years ago. However, they claim administrations of both districts were in touch with each other.

The road ahead


In the last few months, Assam chief minister Sarma has been taking a proactive role in resolving the border disputes not just with Arunachal Pradesh, but with the neighbouring states it has issues with. While Assam and Meghalaya have made some progress, with both governments submitting recommendations to the Centre last month, Sarma has been consistently meeting chief ministers of Nagaland and Arunachal Pradesh as well. However, a concrete plan of action has not been chalked out yet. Just last week, Sarma met Khandu in Guwahati and both described the meeting as “positive”, saying they were ready to conduct a ground-level survey on boundary status.

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First published on: 01-02-2022 at 11:48:06 am
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