According to the Indira Gandhi-Sheikh Mujibur Rahman treaty of 16 May 1974, India and Bangladesh were to hand over the sovereignty of the Tin Bigha Corridor () and South Berubari () to each other, thereby allowing access to the Dahagram–Angarpota enclaves and the Indian enclaves adjacent to South Berubari. Bangladesh did hand over the sovereignty of the smaller South Berubari to India instantly in 1974. India, however, could not transfer the Tin Bigha Corridor to Bangladesh as it required constitutional amendment which could not be done due to political reasons.