The Lower Dibang Valley is the 15th district of Arunachal Pradesh, which came into existence on 16th December, 2001 and Roing being its district headquarter. The district is situated in between 27 ° 30 ” N to 28 ° 38 ” N latitude and the longitude between 95 ° 15 ” E to 96 ° 30 “. This district has an area of 3900 sq. km and shares its border with Dibang Valley District in the North, Assam in the South, Lohit, Anjaw and the Republic of China in the East and East Siang District in the west. It stretches from snowcapped mountain in the north and the plains of the Brahmaputra in the South. It has the green lush forest with deep rivers like Dibang, Deopani, Ithu, Eze, Iphi. Aba, Chifu, Sisiri, Dotung and their various tributaries. The major part of the district is covered by reserve forest which helps the Forest and Environment Departments in revenue earning.
The climate of district is sub-tropical with high humidity and May being the hottest month of the year. Monsoon generally starts with heavy rainfall from the month of April every year. The lower belt of the district experiences hot climate in summer but it becomes progressively cold as one move northward to the higher altitude. The upper belt of the district that is Desali and Hunli circles, enjoy very moderate climate during summer and extreme cold during the winter.
Administratively the Lower Dibang Valley District is divided into three sub-division and seven Circles and inhabited by Mishmi (Idu) and Adi (Padam and Mishing) Tribes of Arunachal Pradesh. Apart from these tribes some small pockets of the district are inhabited by Galo.
Basically the people of the district predominantly practices agriculture and horticulture, and few are engaged in government services. The upper belt of district is highly hostile terrain with rough mountains, where shifting cultivation is widely practiced by the people, while the lower part of belt is covered by fertile land, where both jhum and settled cultivation are practiced in the form of wet rice cultivation (WRC) and Terrace Rice Cultivation (TRC) and also has high fishery potentiality. It has total area of 25,280 Hectares of cultivable area. The principal means of transportation is road and the NH 52 played an important role by connecting inter-state i.e. from Assam to Arunachal. It is the life line of the district. The district has well air connectivity with two days services being pressed in by the civil aviation department through pawans hans and jagson airlines. The PWD roads are spread across all the blocks but most of them get disconnected due to landslide and flood during the monsoon season