East Kameng district is situated in the Western part of Arunachal Pradesh surrounded by West Kameng in the west, Papumpare in the East, Part of Lower Subansiri and Macmohan (International Boundary) line in the North and Sonitpur District of Assam in the South covering an area of 4134 sq kms. The entire district barring a small area on the southernmost tip of Assam is mountainous. The deep gorges and narrow valleys frequently open into wide valleys. The district is an extension part of the North eastward Himalayan range. It lies between 92° 36″ E to 93° 24″ E longitudes and 26° 56″ to 27° 59″ Latitudes.