evidence: Arunachal Pradesh is located in northeast India that shares its international borders with Tibet, Myanmar and Bhutan. It occupies 32,269 sq miles and its capital is Itanagar. The name is attributed to its location as the easternmost state of India. The state is blessed with lush green forests and deep river valleys. Almost every major river valley is home to a different tribe, with a wealth of fascinating cultures and people. [...] The history of Arunachal Pradesh began from the time of Kalika Purana and Mahabharata. The aboriginals of Arunachal Pradesh migrated from Tibet. There are practically no records relating to the earlier history of this place except some oral literature and some historical ruins found mainly in the foot hills dating from the early Christian era. Until 1972, Arunachal Pradesh was administered as the North East Frontier Agency (NEFA). In 1972, it was constituted as a Union Territory of India and renamed Arunachal Pradesh. On 20th February in 1987, it became the 24th state of the Indian Union. [...] Arunachal Pradesh is the largest state in the northeast. The state stretches from the snow-capped eastern Himalayan Mountains range, at an altitude of 6,000 meters, to the plains of the Brahmaputra River valley. Arunachal Pradesh is surrounded by Bhutan, China and Burma. Assam lies to its south. The major rivers that flow through the state are Kameng river, Subansiri, Siang (later Brahmaputra River in Assam), Lohit River and Tirap. The climate varies with elevation.