enclaves became Bangladeshi citizens. Some 1,000 people in the former Indian enclaves chose Indian citizenship and were to be relocated to India by December 2015. Notable enclaves Bangladesh Dahagram–Angarpota: The largest Bangladeshi composite enclave (combining the first- and third-largest Bangladeshi chhits by area), administered as part of Patgram Upazila in Lalmonirhat Zila, lies within the Indian province of West Bengal. It is separated from the contiguous area of Bangladesh at its closest point by . The enclave has an area of with a resident population of 20,000 people. The enclave lacks basic facilities. The lone health complex remains virtually useless because of lack of power supply, as India refused to allow Bangladesh to run power lines to the enclave. After the exchange of enclaves in July 2015, Bangladesh retained it as an exclave. The Tin Bigha Corridor, a strip of Indian territory wide running from the Dahagram–Angarpota composite enclave to the Bangladeshi mainland at their nearest approach, was leased by India in perpetuity to Bangladesh for access to the enclave. It is available for use by the residents of Dahagram–Angarpota. India Dasiar Chhara, the fourth largest Indian chhit by area, was the largest stand-alone Indian enclave (i.e., not a composite of adjoining chhits). It lay from the main part of India and had an area of . Dahala Khagrabari, enclave #51, was the world's only third-order enclave, being a piece of India within Bangladesh, within India, within Bangladesh. It was the site of a jute field. As part of the 2015 border agreement, India ceded it to Bangladesh. List of former enclaves and exclaves Schematic overview: Some individual enclaves were composed of several administrative units (chhits and/or mauzas). These administrative units must be differentiated from the enclave as a whole. "This is particularly important for the Cooch Behar enclaves, where the several administrative units which together form some of the larger enclaves are commonly, but wrongly, termed enclaves themselves, or where one component unit commonly lends its name to the whole enclave. ... [T]he official Indo–Bangladesh Boundary Commission figure of 111 Indian and 51 Bangladeshi exchangeable enclaves would appear to count only individual mauzas, even when these consisted of more than one enclave." There is not a one-to-one relationship between enclaves, chhits and mauzas. All of the information shown in the following two tables has been assembled from Brendan R. Whyte. Bangladesh In order to distinguish chhits having the same