Changlang district is located in the Indian state of Arunachal Pradesh, located south of Lohit district and north of Tirap district. As of 2011 it is the second most populous district of Arunachal Pradesh (out of 16), after Papum Pare
Changlang district occupies an area of 4,662 square kilometres (1,800 sq mi), comparatively equivalent to Indonesia’s Lombok Island.
It falls in a region that receives high rainfall. The region is rich in wildlife with different kind of flora and fauna. The district has both plains and highlands. Most of the plains are in the valley of Dihing. The area is prone to occasional floods.
There is no good road transport in the region. The people are commuting on the roads that Oil India Limited build some decades back.
The 2,000-kilometre-long (1,200 mi) proposed Mago-Thingbu to Vijaynagar Arunachal Pradesh Frontier Highway along the McMahon Line,(will intersect with the proposed East-West Industrial Corridor Highway) and will pass through this district, alignment map of which can be seen here
Places to visit are World War II cemetery in Jairampur, Indo-Myanmar border town Nampong and Pangsau Pass. Another place of interest is Bordumsa where the rich culture of the Tais and Singpho exist.
The Dihing is the main source of fishes for the local people.The fresh water fishes are very much in demand they hardly reach major towns nearby like Tinsukia, Doomdooma, Digboi and Dibrugarh.