Arunachal Pradesh is an Indian state in Northeast India. It was formed from the erstwhile North-East Frontier Agency (NEFA) region, and became a state on 20 February 1987. It borders the states of Assam and Nagaland to the south. It shares international borders with Bhutan in the west, Myanmar in the east, and a disputed border with China in the north at the McMahon Line. Itanagar is the state capital of Arunachal Pradesh. Arunachal Pradesh is the largest of the Seven Sister States of Northeast India by area. Arunachal Pradesh shares 1,129 km border with China's Tibet Autonomous Region.
As of the 2011 Census of India, Arunachal Pradesh has a population of 1,382,611 and an area of 83,743 square kilometres (32,333 sq mi). It is an ethnically diverse state, with predominantly Monpa people in the west, Tani people in the center, Tai people in the east, and Naga people in the south of the state. About 45 tribes/ sub tribes live in the state. The main tribe of the state is Adi and has sub tribes like Adi-abhor, padma, and other tribe that is Mishmi has three sub tribes these are Idu- Mishmi, Digharu-Mishmi and Mizo- Mishmi.
The religious landscape of Arunachal Pradesh is diverse with no single religious group representing the majority of the population. A relatively large percentage of Arunachal's population are nature worshippers (indigenous religions), and follow their own distinct traditional institutions like the Nyedar Namlo by the Nyishi, the Rangfrah by the Tangsa & Nocte, Medar Nelo by the Apatani, the Kargu Gamgi by the Galo and Donyi-Polo Dere by the Adi under the umbrella of the indigenous religion the Donyi-Polo. A small number of Arunachali people have traditionally identified as Hindus, although the number may grow as animist traditions are absorbed into Hinduism. Tibetan Buddhism predominates in the districts of Tawang, West Kameng, and isolated regions adjacent to Tibet. Theravada Buddhism is practised by groups living near the Myanmar border. Around 30% of the population are Christians.
The speakers of major languages of the state according to the 2011 census are Nyishi (20.74%), Adi (17.35%, includes Adi and Gallong), Nepali (6.89%), Tagin (4.54%), Bhotia (4.51%), Wancho (4.23%), Assamese (3.9%), Bengali (3.66%), Hindi (3.45%), Chakma (3.40%), Apatani (3.21%), Mishmi (3.04%), Tangsa (2.64%), Nocte (2.19%), Bhojpuri (2.04%) and Sadri (1.03%).
Modern-day Arunachal Pradesh is one of the linguistically richest and most diverse regions in all of Asia, being home to at least 30 and possibly as many as 50 distinct languages in addition to innumerable dialects and subdialects thereof.