Changlang District covered with picturesque hills lies in the southeastern corner of Arunachal Pradesh, northeast India. It has an area of 4,662 sqr. Km and a population of 1,48,226 persons as per 2011 Census. According to legend the name Changlang owes its origin to the local word CHANGLANGKAN which means a hilltop where people discovered the poisonous herb, which is used for poisoning fish in the river.
Changlang District has reached the stage in its present set up through a gradual development of Administration. Prior to 14th November 1987, it was a part of Tirap District. Under the Arunachal Pradesh Reorganization of Districts Amendment Bill 1987, the Government of Arunachal Pradesh, formally declared the area as a new District on 14th November 1987 and became 10th district of Arunachal Pradesh.