India-Bangladesh Land Boundary Agreement (100th Amendment)

The India-Bangladesh Land Boundary Agreement (LBA) traces its legal lineage to the partition of British India in 1947 and the cartographic chaos that the Radcliffe Award left along the eastern frontier. Its immediate basis is the Indo-Bangladesh Treaty signed by Indira Gandhi and Sheikh Mujibur Rahman on 16 May 1974, formally titled the Agreement Concerning the Demarcation of the Land Boundary between India and Bangladesh and Related Matters. The 1974 accord required both states to amend their constitutions to transfer territory; Bangladesh ratified it in November 1974, but India delayed because the Supreme Court's 1960 ruling in In Re: The Berubari Union held that ceding sovereign territory requires a constitutional amendment under Article 368, not mere executive or legislative action. The unresolved questions were three: the exchange of enclaves (chhitmahals), the settlement of adverse possessions, and the demarcation of roughly 6.1 kilometres of undemarcated border in three sectors. A 2011 Protocol signed during Manmohan Singh's Dhaka visit updated the 1974 framework and provided the implementable detail.

Procedurally, the agreement was given domestic effect in India through the Constitution (One Hundredth Amendment) Act, 2015, which received presidential assent on 28 May 2015. The amendment modified the First Schedule of the Constitution to reflect the acquisition and cession of territory in Assam, West Bengal, Meghalaya, and Tripura. The enabling Bill (originally the 119th Constitutional Amendment Bill) passed the Rajya Sabha on 6 May 2015 and the Lok Sabha on 7 May 2015, both unanimously after sustained cross-party negotiation that overcame earlier objections from the Trinamool Congress and the Asom Gana Parishad. The instruments of ratification were exchanged during Prime Minister Narendra Modi's visit to Dhaka on 6 June 2015, alongside Bangladeshi Prime Minister Sheikh Hasina. The physical transfer of enclaves became effective at midnight on 31 July 2015, after a joint headcount conducted in July 2015 established population figures and citizenship choices.

The mechanics of the exchange were substantial. India transferred 111 enclaves comprising approximately 17,160 acres to Bangladesh, while Bangladesh transferred 51 enclaves of about 7,110 acres to India—162 enclaves in total. The settlement of adverse possessions involved India receiving roughly 2,777 acres and ceding about 2,267 acres. Residents of the exchanged enclaves were given a choice of nationality under a one-time provision: most chose to remain where they lived while changing nationality, but 979 people from the former Indian enclaves inside Bangladesh elected to relocate to India and were resettled in transit camps in Cooch Behar district, West Bengal. The arrangement formally dissolved the world's only third-order enclave, Dahala Khagrabari—an Indian fragment inside a Bangladeshi enclave that was itself inside an Indian enclave inside Bangladesh.

Named implementation unfolded across specific capitals and ministries. The Ministry of External Affairs and the Ministry of Home Affairs coordinated with the West Bengal government under Chief Minister Mamata Banerjee, whose eventual support proved decisive. The joint boundary working groups operated under the Survey of India and Bangladesh's Survey Department. Cooch Behar district administration managed the resettlement, and the former enclave residents—long deprived of schools, electricity, hospitals, and police protection because neither state could legally administer pockets surrounded by the other's territory—were integrated into civic life beginning in August 2015. The Border Security Force and Border Guard Bangladesh adjusted their patrolling lines accordingly.

The LBA must be distinguished from adjacent instruments. It is separate from the maritime boundary dispute between the two states, which was resolved by an Annex VII arbitral tribunal under the UN Convention on the Law of the Sea (UNCLOS) on 7 July 2014, awarding Bangladesh roughly four-fifths of the contested Bay of Bengal area. It is also distinct from the Berubari case, which concerned a specific union in West Bengal and generated the constitutional doctrine—later applied to the LBA—that ceding territory demands an Article 368 amendment rather than the Article 3 procedure used for internal reorganisation. The LBA likewise differs from the Teesta water-sharing agreement, which remains unsigned because of West Bengal's objections and is governed by riparian rather than territorial principles.

Controversies persisted at the edges. Critics in Assam argued the 2011 Protocol initially ceded territory without adequate consultation, prompting the temporary exclusion of Assam from the 2013 draft Bill before its reinstatement in 2015. Questions of citizenship documentation for former enclave dwellers surfaced again during the National Register of Citizens (NRC) process in Assam after 2015 and the Citizenship (Amendment) Act debates of 2019, since former enclave residents required clear records of their newly conferred status. Development of the absorbed enclaves—electrification, road connectivity, and identity-document issuance—proceeded unevenly, and some resettled families reported delays in promised housing and livelihood support in the Cooch Behar transit camps.

For the working practitioner, the LBA is a reference case in three respects. It demonstrates the constitutional threshold for territorial cession in India and the operational role of Article 368, a point of recurring relevance for examinees and desk officers handling border files. It exemplifies neighbourhood diplomacy in which a long-dormant 1974 commitment was honoured through patient domestic consensus-building, frequently cited as a confidence-building measure that strengthened the Modi–Hasina relationship and facilitated cooperation on connectivity, transit, and counter-insurgency. Finally, it stands as a rare instance of two states peacefully exchanging populated territory and rationalising one of the most fragmented land boundaries on earth, offering a template invoked in comparative studies of enclave resolution and a settled foundation for the 4,096-kilometre India-Bangladesh frontier.