India–Bangladesh enclaves

The India–Bangladesh enclaves, also known as the chitmahals (Bengali: ছিটমহল chitmôhol) and sometimes called pasha enclaves, were the enclaves along the Bangladesh–India border, in Bangladesh and the Indian states of West Bengal, Tripura, Assam and Meghalaya. Within the main body of Bangladesh were 102 enclaves of Indian territory, which in turn contained 21 Bangladeshi counter-enclaves, one of which contained an Indian counter-counter-enclave – the world's only third-order enclave. Within the Indian mainland were 71 Bangladeshi enclaves, containing 3 Indian counter-enclaves. A joint census in 2010 found 51,549 people residing in these enclaves: 37,334 in Indian enclaves within Bangladesh and 14,215 in Bangladeshi enclaves within India.

The prime ministers of India and Bangladesh signed the Land Boundary Agreement in 1974 to exchange enclaves and simplify their international border. A revised version of the agreement was adopted by the two countries on 7 May 2015, when the Parliament of India passed the 100th Amendment to the Indian Constitution. Under this agreement, which was ratified on 6 June 2015, India received 51 Bangladeshi enclaves (covering 7,110 acres (2,880 ha)) in the Indian mainland, while Bangladesh received 111 Indian enclaves (covering 17,160 acres (6,940 ha)) in the Bangladeshi mainland. The counter-enclaves, together with Dahagram-Angarpota, will not be exchanged when the Indira-Mujib agreement of 1974 is finally implemented. The enclave residents are to be allowed to either reside at their present location or move to the country of their choice. The physical exchange of enclaves will be implemented in phases between 31 July 2015 and 30 June 2016. The enclaves stand exchanged on the midnight of 31 July 2015 and the transfer of enclave residents was completed on 30 November 2015. After the Land Boundary Agreement, India lost around 40 square kilometres (15 sq mi) to Bangladesh.

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