The District of Lower Subansiri, which is lying approx between 92º40' and 94°21' East Longitude and 26°55" and 28°21' North Latitudes, covers an area of 3,460 (approx) Sq.km., is bounded on the North by Kurung-Kumey and Upper Subansiri Districts of Arunachal; on the South by Papum Pare District of Arunachal Pradesh and Assam ; on the East by West Siang and some part of Upper Subansiri ; and on the West by Kurung-Kumey and Papumpare Districts of Arunachal Pradesh.  The altitude of Lower Subansiri district headquarters is 1500 meters above sea level.