India-Bangladesh Enclaves (Chhitmahals)

The India-Bangladesh enclaves, known locally as chhitmahals, were fragments of sovereign territory belonging to one state but lying entirely encircled by the other. Their origin is conventionally traced to dynastic arrangements between the Maharaja of Cooch Behar and the Mughal Nawab of Rangpur in the eighteenth century, the boundaries reportedly fixed through wagers and treaties that left scattered villages under each ruler's jurisdiction. When Cooch Behar acceded to the Indian Union on 28 August 1949 and the surrounding districts became part of East Pakistan, these scattered holdings were frozen into an international anomaly. The 1947 Radcliffe Award, which partitioned Bengal, did not resolve the enclaves; they survived the creation of East Pakistan and, after 1971, of Bangladesh. The principal legal instrument addressing them was the Nehru-Noon Agreement of 10 September 1958, followed by the Indira-Mujib Land Boundary Agreement of 16 May 1974, neither of which was fully implemented for decades.

The procedural resolution turned on constitutional ratification within India. The 1974 Land Boundary Agreement (LBA) required India to cede territory, and Indian jurisprudence — following the Supreme Court's reasoning in In re Berubari Union (1960) — held that transferring sovereign territory necessitated a constitutional amendment, not merely executive action. The amendment stalled for forty years. Momentum returned with the 2011 Protocol to the LBA signed during Prime Minister Manmohan Singh's visit to Dhaka, which detailed the exchange of enclaves and the adverse possessions. The enabling legislation, the Constitution (One Hundredth Amendment) Act, 2015, was passed unanimously by both houses of the Indian Parliament in May 2015 and ratified during Prime Minister Narendra Modi's June 2015 visit to Dhaka. The instruments of exchange of ratification took legal effect at the stroke of midnight between 31 July and 1 August 2015.

The mechanics of the swap involved 162 enclaves: 111 Indian enclaves inside Bangladesh (covering roughly 17,160 acres) transferred to Bangladesh, and 51 Bangladeshi enclaves inside India (roughly 7,110 acres) transferred to India. The exchange also addressed "adverse possessions" — plots controlled by one country though formally belonging to the other — and the so-called counter-enclaves, the most famous being Dahala Khagrabari, an Indian enclave inside a Bangladeshi enclave inside an Indian enclave inside Bangladesh, the world's only third-order enclave at the time. Critically, the residents of the exchanged enclaves were given a choice of nationality: a joint headcount in July 2011 had recorded approximately 51,000 enclave dwellers, and after the exchange they could either retain their existing location with new citizenship or relocate to the country of their original nationality.

In contemporary terms, implementation was coordinated between the Ministry of External Affairs in New Delhi, the Ministry of Home Affairs, the Government of West Bengal in Kolkata, and Bangladesh's Ministry of Foreign Affairs in Dhaka. On the ground, the affected districts were Cooch Behar in West Bengal and the Bangladeshi districts of Lalmonirhat, Panchagarh, Kurigram, and Nilphamari. Around 922 residents of the former Bangladeshi enclaves in India opted for Indian citizenship-by-residence, while a comparable cohort of former Indian enclave dwellers in Bangladesh chose to relocate to India and were resettled in transit camps near Mekhliganj, Dinhata, and Haldibari. Rehabilitation packages, voter registration, and the extension of electricity, schools, and ration cards followed in stages through 2015 and 2016.

The chhitmahals must be distinguished from adjacent concepts. They are not an exclave problem in the simple sense — every enclave was simultaneously an exclave of its parent state and an enclave within the host. They differ from disputed territory such as Kashmir, because sovereignty over each enclave was never legally contested; the title was clear, only the geography was absurd. They also differ from the broader question of border demarcation and the still-unfenced stretches of the 4,096-kilometre India-Bangladesh boundary, where issues of riverine boundaries, char lands, and cattle smuggling persist independent of the enclave settlement. The enclave exchange resolved a question of territorial title; it did not resolve the wider border-management agenda overseen by the Border Security Force and the Border Guard Bangladesh.

Several edge cases and controversies endure. The enclave residents had lived stateless in practice for sixty-eight years — without legal access to schools, hospitals, electricity, or policing, since neither government could administer territory it could not physically reach. Human-development indicators in the chhitmahals lagged far behind surrounding districts. Post-exchange, disputes arose over land records, compensation valuations, and the integration of populations whose documentation was non-existent. The settlement is frequently cited as a rare instance of two states resolving a territorial dispute through mutual cession and parliamentary consensus rather than arbitration or conflict, and is studied alongside the Baarle-Hertog/Baarle-Nassau enclaves on the Belgium-Netherlands frontier as the two principal real-world cases of complex enclave geography.

For the working practitioner, the chhitmahals episode is instructive on several fronts. It demonstrates the interaction between domestic constitutional law and treaty implementation — the forty-year delay flowed entirely from India's internal requirement for a constitutional amendment, a recurring constraint in Indian foreign policy. It illustrates confidence-building between neighbours, since the 2015 exchange improved the bilateral atmosphere ahead of subsequent connectivity, transit, and water-sharing negotiations. For UPSC and policy candidates, it exemplifies the nexus of internal security, citizenship, federal-state coordination, and border management. And it stands as a model for how states can convert a colonial-era anomaly into a humane settlement that prioritised the affected population's right to choose their nationality.