Upper Siang - a district in the State of Arunachal Pradesh in India with geographical area of 6188 Sq Km, a veritable treasure house of nature in its full splendour, has 11 Administrative Circles with a total population of 33, 146 persons (2001 Census). It is inhabited by Adi, Memba, Khamba and Idu Mishmi tribes who have been harmoniously living in the cradle of nature since time immemorial with colourful festivals / rituals like Solung, Aran, Reh, Lossar, Dihang, etc.
It is a mountaineous region endowed with rich natural resources and biodiversity, deep gorges and fast flowing streams and rivulets, which form the tributaries of the mighty Siang River. It flows through the district running into Indian Territory at a point near Gelling in the Indo-China border.
There have been radical changes over the years on all developmental fronts. However, the long isolation and inaccesibility of the areas due to communication bottlenecks pose formidable constraints to the efforts for socio-economic developments.