1. The World's Most Bizarre Territorial Complex
Until midnight on 31 July 2015, the international border between India and Bangladesh harbored the most dense, bewildering concentration of enclaves anywhere on Earth. Spanning the Cooch Behar district of West Bengal, India, and the Rangpur Division of Bangladesh, the region contained 162 discrete enclaves (known locally as chitmahals):
- 102 Indian enclaves inside Bangladesh (plus 21 Bangladeshi counter-enclaves inside them).
- 71 Bangladeshi enclaves inside India (plus 3 Indian counter-enclaves inside them).
- Dahala Khagrabari (#51): The world's only recorded third-order enclave (a counter-counter-enclave)—a piece of India within a Bangladeshi enclave, itself situated inside an Indian enclave, inside sovereign Bangladesh.
2. Feudal Origins: Chess Matches and Mughal Treaties
Popular folklore attributed the fragmented archipelago of lands to high-stakes chess matches and dice games played between the Maharaja of Cooch Behar and the Faujdar of Rangpur (representing the Mughal Empire). However, rigorous cartographic and legal records reveal that the enclaves originated from the peace treaty of 1713 between the Mughal Empire and the Kingdom of Cooch Behar.
Under this feudal settlement, local landlords and tax collectors (zamindars) retained allegiance to their respective rulers, creating disjointed estates where sovereignty followed personal fealty rather than contiguous geography. When the British East India Company assumed the Diwani of Bengal in 1765 and later established British paramountcy over the princely state of Cooch Behar in 1773, colonial administrators left these customary revenue pockets intact to preserve local tax yields.
3. Post-Partition Stranding: The 1947 Radcliffe Line
The creation of modern India and Pakistan in August 1947 by Sir Cyril Radcliffe turned these minor revenue discrepancies into an international crisis. Radcliffe used existing district boundaries to demarcate East Pakistan from India without attempting to rationalize individual chitmahals. When the princely state of Cooch Behar acceded to the Republic of India in 1949 and was integrated into West Bengal in 1950, its enclaves in East Bengal (later Bangladesh) were permanently severed from Indian civil administration.
For nearly seven decades, more than 50,000 residents lived in a state of jurisdictional limbo. Enclave inhabitants possessed no legal identity cards, had no police protection, could not vote, and had zero access to mainland electricity grids, hospitals, paved roads, or post offices without illegally crossing international borders.
4. The Breakthrough: The 2015 Historic Land Swap
Although the groundwork was established by Prime Ministers Indira Gandhi and Sheikh Mujibur Rahman in the 1974 Land Boundary Agreement (LBA), Indian constitutional hurdles and domestic political sensitivities delayed ratification for over four decades.
On 7 May 2015, the Parliament of India unanimously passed the 100th Constitutional Amendment Act, paving the way for the exchange. On 6 June 2015, Prime Ministers Narendra Modi of India and Sheikh Hasina of Bangladesh signed the formal instruments of ratification in Dhaka.
Terms of the Historic Midnight Exchange
- India transferred 111 enclaves (17,160.63 acres) to sovereign Bangladesh.
- Bangladesh transferred 51 enclaves (7,110.02 acres) to sovereign India.
- All residents were given an unrestricted choice to either adopt the citizenship of the receiving state or relocate to their original sovereign homeland with government assistance.
5. The Human Dimension & The Tin Bigha Corridor
At the historic stroke of midnight on 31 July 2015, thousands of enclave residents lit candles, hoisted national flags, and celebrated the acquisition of formal citizenship for the first time in their lives. Out of over 51,000 residents, approximately 98% chose to remain in their ancestral homes and accept the nationality of the country surrounding them, while only 987 individuals chose to relocate to India.
The only significant exclave retained under special arrangement was the Dahagram–Angarpota Bangladeshi enclave inside India, which remains connected to mainland Bangladesh 24 hours a day via the famous Tin Bigha Corridor, an open transit strip leased in perpetuity to Bangladesh.