The valley of the Siang is populated by a number of tribes. The Membas and the Khampas, Budhists, who migrated from Tibet inhabit the upper reaches of the Siang and the Lang Sang Chu valleys.
The Tibetian influence is clearly seen in the Gompas - Budhist shrines with elaborate carved wooden buildings, golden Buddha statues, old scrolls and the mask dance. They produce beautiful painted masks, thanka paintings and carved furniture. The middle and the lower valleys are populated by the worshippers of Donyi-Polism - the Sun and the moon gods and the forces of nature.

The Adis, l Galos and the Mishmis have structured social organisations, traditional justice systems and intricate weaving & bamboo handicrafts. Life in the difficult mountains has produced an independent & hospitable people with a strong sense of justice.

The Brahmaputra darshan will showcase the tribal culture by dance displays, handicrafts & food festivals, traditional sports & village shows.

The population of Arunachal is 1,091,117 according to 2001 census and is scattered over 12 towns and 3649 villages. The State has the lowest density of 13 persons per sq. km. As against decadal growth rate of 21.34% at the national level, the population of the State has grown by 26.21% over the period 1991-2001. The sex ratio of Arunachal Pradesh at 901 females to 1000 males is lower than the national average of 933.

Total literacy of the State rose to 54.74% from 41.59% in 1991. The number of literates is 487,796. There are 20 major tribes and a number of sub-tribes inhabiting the area. Most of these communities are ethnically similar, having derived from and original common stock but their geographical isolation from each other has brought amongst them certain distinctive characteristics in language, dress and customs.


CULTURAL GROUPS :
Broadly the people may be divided into three cultural groups on the basis of their socio-religious affinities.

The Monpas and Sherdukpens of Tawang and West Kameng districts follow the lamaistic tradition of Mahayana Buddhism. Noted for their religious fervour, the villages of these communities have richly decorated Buddhist temples, locally called ‘Gompas‘. Though largely agriculturists practising terrace cultivation, many of these people are also pastoral and breed herds of yak and mountains sheep. Culturally similar to them are Membas and Khambas who live in the high mountains along the northern borders. Khamptis and Singphos inhabiting the eastern part of the State are Buddhists of Hinayana sect. They are said to have migrated from Thailand and Burma long ago and still using ancient scripts derived from their original homeland.

The second group of the people are Adis, Akas, Apatanis, Bangnis, Nishis, Mishmis, Mijis, Thongsas etc., who worship Sun and Moon God namely, Donyi-Polo and Abo-Tani, the original ancestors for most of these tribes. Their religious rituals, largely coincide with phases of agricultural cycles. They invoke nature deities and make animal scarifices. They traditionally practice jhumming or shifting cultivation. Adis and Apatanis extensively practice wet rice cultivation and have a considerable agricultural economy. Apatanis are also famous for their paddy-cum-pisciculture. They are specialised over centuries in harvesting two crops of fish along with each crop of the paddy.

The third group comprises Noctes and Wanchos,adjoining Nagaland in the Tirap District. These are hardy people known for their strictly structured village society in which hereditary village chief still plays a vital role. The Noctes also practise elementary form of Vaishnavism.