Arunachal Pradesh is one of the twenty-nine states of the Republic of India. Located in northeast India, it holds the most north-eastern position among the states in the north-east region of India. Arunachal Pradesh borders the states of Assam and Nagaland to the south, and shares international borders with Bhutan in the west, Burma in the east and China in the north. Itanagar is the capital of the state.

Most of the state, formerly called the North-East Frontier Agency, was ceded to Britain by the Tibetan government with the Simla Accord (1914). China does not recognize the legality of that treaty, and claims most of the state as South Tibet. The state is seen to have major potential for hydropower development.

Arunachal Pradesh, whose name means Land of the Dawn-Lit Mountains in Sanskrit, is also known as the Orchid State of India or the Paradise of the Botanists. Geographically, it is the largest among the North-east Indian states commonly known as the Seven Sister States. As in other parts of Northeast India, the people native to the state trace their origins to the Tibeto-Burman people. In recent times, large number of migrants from various parts of India and other lands have built extensive economic and cultural ties with the state’s population.

No reliable population count of the migrant population exists, and the percentage estimating the total actual population accordingly, vary. Arunachal Pradesh has the highest number of regional languages in the Indian subcontinent, enriched with diverse culture and traditions.


Arunachal Pradesh is located between 26.28° N and 29.30° N latitude and 91.20° E and 97.30° E longitude and has 83,743 square kilometre area.

Most of Arunachal Pradesh is covered by the Himalayas. However, parts of Lohit, Changlang and Tirap are covered by the Patkai hills. Kangto, Nyegi Kangsang, the main Gorichen peak and the Eastern Gorichen peak are some of the highest peaks in this region of the Himalayas. The land is mostly mountainous with the Himalayan ranges running north south. These divide the state into five river valleys: the Kameng, the Subansiri, the Siang, the Lohit and the Tirap. All these are fed by snow from the Himalayas and countless rivers and rivulets. The mightiest of these rivers is Siang, called the Tsangpo in Tibet, which becomes the Brahmaputra after it is joined by the Dibang and the Lohit in the plains of Assam.

At the lowest elevations, essentially at Arunachal Pradesh’s border with Assam, are Brahmaputra Valley semi-evergreen forests. Much of the state, including the Himalayan foothills and the Patkai hills, are home to Eastern Himalayan broadleaf forests. Toward the northern border with Tibet, with increasing elevation, come a mixture of Eastern and Northeastern Himalayan subalpine conifer forests followed by Eastern Himalayan alpine shrub and meadows and ultimately rock and ice on the highest peaks.

The Himalayan ranges that extend up to the eastern Arunachal separate it from Tibet. The ranges extend toward Nagaland, and form a boundary between India and Burma in Changlang and Tirap district, acting as a natural barrier called Patkai Bum Hills. They are low mountains compared to the Greater Himalayas.

Himachal Pradesh

The climate of Arunachal Pradesh varies with elevation. Areas that are at a very high elevation in the Upper Himalaya close to the Tibetan border have an alpine or tundra climate. Below the Upper Himalayas are the Middle Himalayas, where people experience a temperate climate. Areas at the sub-Himalayan and sea-level elevation generally experience humid, sub-tropical climate with hot summers and mild winters.

Arunachal Pradesh receives heavy rainfall of 2,000 to 4,100 millimetres (79 to 161 in) annually, most of it between May and September. The mountain slopes and hills are covered with alpine, temperate, and subtropical forests of dwarf rhododendron, oak, pine, maple, fir, and juniper; sal(Shorea robusta) and teak are the main economically valuable species.


Arunachal Pradesh can be roughly divided into a set of semi-distinct cultural spheres, on the basis of tribal identity, language, religion and material culture: the Tibetic area bordering Bhutan in the west, the Thanyi area in the centre of the state, the Mishmi area to the east of the Thanyi area, the Tai/Singpho/Tangsa area bordering Myanmar, and the “Naga” area to the south, which also borders Myanmar. In between there are transition zones, such as the Aka/Hruso/Miji/Sherdukpen area, which provides a “buffer” of sorts between the Tibetic Buddhist tribes and the animist Thanyi hill tribes. In addition, there are isolated peoples scattered throughout the state, such as the Sulung.

Within each of these cultural spheres, one finds populations of related tribes speaking related languages and sharing similar traditions. In the Tibetic area, one finds large numbers of Monpa tribespeople, with several subtribes speaking closely related but mutually incomprehensible languages, and also large numbers of Tibetan refugees. Within the Thanyi area, major tribes include the Nyishi, which many people have recently come to apply to encompass the derogatory words; like dafla & Hills Miri. Apatani also live among the Nyishi, but are distinct. In the centre, one finds predominantlyGalo people, with the major sub-groups of Karka, Lodu, Bogum, Lare and Pugo among others, extending to the Ramo and Pailibo areas (which are close in many ways to Galo). In the east, one finds the Adi with many subtribes including Padam, Pasi, Minyong and Bokar, among others. Milang, while also falling within the general “Adi” sphere, are in many ways quite distinct. Moving east, the Idu, Miju and Digaru make up the “Mishmi” cultural-linguistic area, which may or may not form a coherent historical grouping.



Itanagar Airport, a Greenfield project serving Itanagar is being planned at Holongi at a cost of Rs. 6.50 billion. The existing state owned Daporijo Airport, Ziro Airport, Along Airport, Tezu Airport and Pasighat Airport are small and are not in operation. The government has proposed to operationalise these airports. Before the state was connected by roads, these airstrips were originally used for the transportation of food.


Arunachal Pradesh has two highways: the 336 km National Highway 52, completed in 1998, which connects Jonai with Dirak, and another highway, which connects Tezpur in Assam with Tawang. As of 2007, every village has been connected by road thanks to funding provided by the central government. Every small town has its own bus station and daily bus services are available. All places are connected to Assam, which has increased trading activity. An additional National Highway is being constructed following the Stillwell Ledo Road, which connects Ledo in Assam to Jairampur in Arunachal. Work on the ambitious 2,400 km two-lane Trans-Arunachal Highway Project announced by Prime Minister Manmohan Singh on 31 January 2008 on his maiden visit to the state, was scheduled to be completed by 2015–16 but now due to political and social reasons it may take another decade.

In 2014, two major highways were proposed to be built in the state: East-West Industrial Corridor Highway, Arunachal Pradesh in the lower foot hills of the state and 2,000-kilometre-long (1,200 mi) Mago-Thingbu to Vijaynagar Arunachal Pradesh Frontier Highway along the McMahon Line,


Arunachal Pradesh got its first railway line in late 2013 with the opening of the new link line from Harmuti on the main Rangpara North-Murkongselak railway line to Naharlagun in Arunachal Pradesh. The construction of the 33 kilometre 1,676 mm (5 ft 6 in) broad gauge railway line was completed in 2012, and the link became operational after the gauge conversion of the main line under Project Unigauge. The state capital Itanagar was added to the Indian railway map on 12 April 2014 via the newly built 20 kilometre Harmuti-Naharlagun railway line, when a train from Dekargaon in Assam reached Naharlagun railway station, 10 kilometres from the centre of Itanagar, a total distance of 181 kilometres.

On 20 February 2015 the first through train was run from New Delhi to Naharlagun, flagged off from the capital by the Indian prime minister, Narendra Modi. India plans to eventually extend the railway to Tawang, near the border with China.