Arunachal Pradesh (; lit. 'Dawn-Lit Mountain Province') is a state in northeast India. It was known as the North-East Frontier Agency until 1972, after which it became a union territory under the name Arunachal Pradesh. It became a state on 20 February 1987. Itanagar is its capital and largest town.

It shares international borders with Bhutan in the west, Myanmar in the east, and a disputed 1,129 km border with China's Tibet Autonomous Region in the north at the McMahon Line. Nearly four-fifths of Arunachal Pradesh is claimed by China as Southern Tibet as part of the Tibet Autonomous Region; China occupied some regions of Arunachal Pradesh in 1962 but later withdrew its forces.

As per the 2011 census, Arunachal Pradesh has a population of 1,383,727. With only 17 inhabitants per square kilometre, it is the least densely populated state in India. It is an ethnically diverse state, with predominantly Monpa people in the west, Tani people in the centre, Mishmi and Tai people in the east, and Naga people in the southeast of the state. About 23 major tribes and 100 sub-tribes live in the state, including Nocte, Adi, Nyishi, Singpho, Galo, Tagin, and Apatani. The Nyishi are the largest ethnic group in the region. The Mishmi tribe has three sub-tribes, namely Idu-Mishmi, Digaru-Mishmi, and Miju-Mishmi.

Arunachal Pradesh
Abhishek Gaurav, from Tezpur university, Assam · CC BY-SA 4.0 via Wikimedia Commons

Etymology

Arunachal Pradesh means Land of the Dawn-Lit Mountains, which is the sobriquet for the state in Sanskrit. The term was coined during the formation of the state. Prior to the year 1972, it was called North-East Frontier Agency.

The People's Republic of China (PRC) does not recognise Arunachal Pradesh, and claims the land to be part of Tibet, calling it Southern Tibet (Chinese: 藏南 pinyin: Zàngnán). In ancient Tibetan texts, eastern Arunachal Pradesh and some parts of Tibet were called Lhoyü while the residents were called Lhobha people, while Tawang district and West Kameng district in western Arunachal Pradesh were called Monyul.