Arunachal Pradesh, bordered on the south by Assam state, on the west by Bhutan, on the north and northeast by China, and on the east by Myanmar (formerly known as Burma) is a sparsely populated mountainous area in the extreme northeastern part of the subcontinent. Arunachal Pradesh (Sanskrit for "Land of the Rising Sun") has an area of 83,743 sq km. Most of Arunachal Pradesh is mountainous. Its terrain consists of lofty, haphazardly aligned ridges that separate deep valleys and rise to the peaks of the Great Himalayas. The state's main rivers are the Brahmaputra known in Arunachal Pradesh as the Siang, and its tributaries, the Tirap, the Lohit (ZayŁ Qu), the Subansiri, and the Bhareli. The climate of the foothills is subtropical; in the mountains, temperatures decrease rapidly with altitude. Rainfall averages between 2000 and 4000 mm (80 and 160 in) a year.
Arunachal Pradesh has a single-chamber Legislative Assembly, which has 60 seats. The state sends three members to the Indian national parliament: one to the Rajya Sabha (upper house) and two to the Lok Sabha (lower house). Local government is based on 12 administrative districts