Northeast India - Wikipedia Northeast India This article is about North Eastern Region ( NER ) of India. For other uses, see Northeast ( disambiguation ). in, India Northeast India Country India States Arunachal Pradesh Assam Manipur Meghalaya Mizoram Nagaland Sikkim Tripura Largest city Guwahati Major cities ( 2011 Census of India ) Arunachal Pradesh Itanagar Naharlagun Pasighat Aalo Seppa Likabali Basar Assam Guwahati Silchar Jorhat Dibrugarh Nagaon Sivasagar Tezpur Manipur Imphal Churachandpur Thoubal Ukhrul Meghalaya Shillong Tura Mawlai Nongthymmai Madanrting Mizoram Aizawl Lunglei Champhai Saiha Kolasib Nagaland Dimapur Kohima Tuensang Mokokchung Wokha Sikkim Gangtok Namchi Rangpo Jorethang Rhenak Tripura Agartala Dharmanagar Udaipur Kailasahar Khowai Area Total 262,230 km ( 101,250 sq mi ) Population ( 2011 Census of India ) Total 45,772,188 Density 170 / km ( 450 / sq mi ) Time zone Indian Standard Time ( UTC + 5 : 30 ) Official languages Assamese Bengali Bodo Garo Khasi Kokborok Nyishi Galo Adi Meitei Nepali Hindi English Northeast India ( officially North Eastern Region, NER ) is the easternmost region of India representing both a geographic and political administrative division of the country. It comprises eight states -- Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland, Sikkim and Tripura. The Siliguri Corridor in West Bengal, with a width of 21 to 40 kilometres ( 13 to 25 mi ), connects the North Eastern Region with East India. The region shares an international border of 5,182 kilometres ( 3,220 mi ) ( about 99 percent of its total geographical boundary ) with the neighbouring countries -- 1,395 kilometres ( 867 mi ) with Tibet Autonomous Region, China in the north, 1,640 kilometres ( 1,020 mi ) with Myanmar in the east, 1,596 kilometres ( 992 mi ) with Bangladesh in the south - west, 97 kilometres ( 60 mi ) with Nepal in the west and 455 kilometres ( 283 mi ) with Bhutan in the north - west. It comprises an area of 262,230 square kilometres ( 101,250 sq mi ), almost 8 percent of that of India, and is one of the largest salient ( panhandle ) in the world. The states of North Eastern Region are officially recognised under the North Eastern Council ( NEC ), constituted in 1971 as the acting agency for the development of the north eastern states. Long after induction of NEC, Sikkim formed part of the North Eastern Region as the eighth state in 2002. India 's Look - East connectivity projects connect Northeast India to China and ASEAN. Contents 1 History 1.1 Formation of North Eastern states 1.2 Seven Sister States 1.3 World War II 1.4 Sino - Indian War ( 1962 ) 2 Geography 2.1 Topography 2.1. 1 Highest peaks 2.1. 2 Brahmaputra River Basin 2.2 Climate 2.3 High risk seismic zone 3 Wildlife 3.1 Flora 3.2 Fauna 3.3 National Parks 3.4 State Symbols 4 Demographics 4.1 Largest cities by population 4.2 Languages 4.2. 1 Official languages 4.2. 2 Etymology of state names 4.2. 3 Endangered languages 4.3 Religions 4.4 Ethnic groups 4.4. 1 Major communities 5 Culture 5.1 Cuisines 5.2 Arts 6 Administration and political disputes 6.1 International borders management 6.2 Pan-states development authorities 6.2. 1 Development and connectivity projects 6.3 States and sub-divisions 6.4 Government 6.5 21st century separatist unrest 6.5. 1 Malom Massacre 7 Economy 7.1 Industries 7.1. 1 Agriculture 7.1. 2 Tourism 7.2 Transportation 7.2. 1 Air 7.2. 2 Railway 7.3 Look East Policy 8 See also 9 References 9.1 Citations 9.2 Sources cited 10 Official Sites History Further information : History of Assam, History of Manipur, and History of Tripura The traditional map of Kamarupa from first millennium sources Assam annexation to British India in 1838. Eastern Bengal and Assam in 1907 The earliest settlers may have been Austro - Asiatic speakers from Southeast Asia, followed by Tibeto - Burmese from China and by 500 B.C. Indo - Aryans speakers from Gangetic Plains. Due to the bio - and crop diversity of the region, archaeological researchers believe that early settlers of Northeast India had domesticated several important plants. Writers believe that the 100 BC writings of Chinese explorer, Zhang Qian indicate an early trade route via Northeast India. The Periplus of the Erythraean Sea mention a people called Sêsatai in the region, who produced malabathron, so prized in the old world. In the early historical period ( most of first millennium ), Kamarupa straddled most of present - day Northeast India, besides Bhutan and Sylhet in Bangladesh. Xuanzang, a travelling Chinese Buddhist monk, visited Kamarupa in the 7th century. He described the people as `` short in stature and black - looking '', whose speech differed a little from mid-India and who were of simple but violent disposition. He wrote that the people in Kamarupa knew of Sichuan, which lay to the kingdom 's east beyond a treacherous mountain. For many of the tribal peoples, their primary identification is with subtribes and villages, which have distinct dialects and cultures. The northeastern states were established during the British Raj of the 19th and early 20th centuries, when they became relatively isolated from traditional trading partners such as Bhutan and Myanmar. Many of the peoples in present - day Mizoram, Meghalaya and Nagaland converted to Christianity under the influence of British ( Welsh ) missionaries. Formation of North Eastern states In the early 19th century, both the Ahom and the Manipur kingdoms fell to a Burmese invasion. The ensuing First Anglo - Burmese War resulted in the entire region coming under British control. In the colonial period ( 1826 -- 1947 ), North East India was made a part of Bengal Province from 1839 to 1873, when Assam became its own province. After Indian Independence from British Rule in 1947, the Northeastern region of British India consisted of Assam and the princely states of Manipur and Tripura. Subsequently, Nagaland in 1963, Meghalaya in 1972, Arunachal Pradesh in 1975 ( capital changed to Itanagar ) ( formed on 20 February 1987 ) and Mizoram in 1987 were formed out of the large territory of Assam. Manipur and Tripura remained as Union Territories of India between 1956 until 1972, when they attained fully - fledged statehood. Sikkim was integrated as the eighth North Eastern Council state in 2002. The city of Shillong served as the capital of the Assam province created during British Rule. It remained as the capital of undivided Assam until formation of the state of Meghalaya in 1972. The capital of Assam was shifted to Dispur, a part of Guwahati, and Shillong was designated as the capital of Meghalaya. State Historic Name Capital ( s ) Statehood Arunachal Pradesh North - East Frontier Agency Itanagar 1987 ( earlier a Union Territory of India, constituted in 1971 ) Assam Pragjyotisha, Kamarupa Shillong ( till 1969 ), Dispur 1947 Manipur Kangleipak Imphal 1971 ( earlier a Union Territory of India, constituted in 1956 ) Meghalaya Khasi hills, Jaintia hills and Garo hills Shillong 1971 Mizoram Lushai hills Aizawl 1987 ( earlier a Union Territory of India, constituted in 1971 ) Nagaland Naga hills Kohima 1963 Sikkim Sukhim Gangtok Tripura Tipperah Agartala 1971 ( earlier a Union Territory of India, constituted in 1956 ) Seven Sister states Seven Sister States The Seven Sister States is a popular term for the contiguous states of Arunachal Pradesh, Assam, Meghalaya, Manipur, Mizoram, Nagaland and Tripura prior to inclusion of the state of Sikkim into the North Eastern Region of India. The sobriquet ' Land of the Seven Sisters ' was coined to coincide with the inauguration of the new states in January 1972 by Jyoti Prasad Saikia, a journalist in Tripura, in the course of a radio talk show. He later compiled a book on the interdependence and commonness of the Seven Sister States, and named it the Land of Seven Sisters. It has been primarily because of this publication that the nickname has caught on. World war ii Main articles : Battle of Kohima and Battle of Imphal In 1944, the Japanese planned a daring attack on India. Traveling through Burma, its forces were stopped at Kohima and Imphal by British and Indian troops. This marked the furthest western expansion of the Japanese Empire ; its defeat in this area presaged Allied victory. Sino - Indian war ( 1962 ) Main article : Sino - Indian War Arunachal Pradesh, a state in the Northeastern tip of India, is claimed by China as South Tibet. Sino - Indian relations degraded, resulting in the Sino - Indian War of 1962. The cause of the escalation into war is still disputed by both Chinese and Indian sources. During the war in 1962, the PRC ( China ) captured much of the NEFA ( North - East Frontier Agency ) created by India in 1954. But on 21 November 1962, China declared a unilateral ceasefire, and withdrew its troops 20 kilometres ( 12 mi ) behind the McMahon Line. It returned Indian prisoners of war in 1963. Geography Brahmaputra plain and Eastern Himalaya in Northeast India The Northeast region can be physiographically categorised into the Eastern Himalaya, the Patkai and the Brahmaputra and the Barak valley plains. Northeast India ( at the confluence of Indo - Malayan, Indo - Chinese, and Indian biogeographical realms ) has a predominantly humid sub-tropical climate with hot, humid summers, severe monsoons, and mild winters. Along with the west coast of India, this region has some of the Indian sub-continent's last remaining rain forests, which support diverse flora and fauna and several crop species. Reserves of petroleum and natural gas in the region are estimated to constitute a fifth of India 's total potential. The region is covered by the mighty Brahmaputra - Barak river systems and their tributaries. Geographically, apart from the Brahmaputra, Barak and Imphal valleys and some flat lands in between the hills of Meghalaya and Tripura, the remaining two - thirds of the area is hilly terrain interspersed with valleys and plains ; the altitude varies from almost sea - level to over 7,000 metres ( 23,000 ft ) above MSL. The region 's high rainfall, averaging around 10,000 millimetres ( 390 in ) and above, creates problems of ecosystem, high seismic activity, and floods. The states of Arunachal Pradesh and Sikkim have a montane climate with cold, snowy winters and mild summers. Ropeway, Gangtok Aizawl, Mizoram Aerial view of Shillong Dzükou Valley ( Borders of Manipur and Nagaland ) Sela Pass, Tawang ( Arunachal Pradesh ) Bhalukpong, Arunachal Pradesh Loktak lake, Manipur Majuli Island, Assam Nohkalikai Falls, Cherrapunji Topography Highest peaks Mt. Kanchenjunga, Sikkim Teesta River, Sikkim Main article : List of Indian states and territories by highest point Kangchenjunga, the third highest mountain peak in the world rising to an altitude of 8,586 m ( 28,169 ft ), lies in - between the state Sikkim and adjacent country Nepal. Mountains and hills by state Peak State Range / Region Height ( m ) Height ( ft ) Kangchenjunga ( shared with Nepal ) Sikkim Eastern Himalaya 8,586 28,169 27 ° 42 ′ 11 '' N 88 ° 08 ′ 53 '' E ﻿ / ﻿ 27.703 ° N 88.148 ° E ﻿ / 27.703 ; 88.148 Kangto ( shared with Tibet ) Arunachal Pradesh Eastern Himalaya 7,090 23,261 27 ° 51 ′ 54 '' N 92 ° 31 ′ 59 '' E ﻿ / ﻿ 27.865 ° N 92.533 ° E ﻿ / 27.865 ; 92.533 Mount Saramati ( Shared with Myanmar ) Nagaland Naga Hills 3,841 12,602 25 ° 44 ′ 31 '' N 95 ° 01 ′ 59 '' E ﻿ / ﻿ 25.742 ° N 95.033 ° E ﻿ / 25.742 ; 95.033 Mount Iso ( also known as Tenipu ) Manipur Senapati District 2,994 9,823 25 ° 31 ′ 52 '' N 94 ° 05 ′ 06 '' E ﻿ / ﻿ 25.531 ° N 94.085 ° E ﻿ / 25.531 ; 94.085 Phawngpui ( Blue Mountain ) Mizoram Saiha District 2,165 7,103 22 ° 37 ′ 55 '' N 93 ° 02 ′ 20 '' E ﻿ / ﻿ 22.632 ° N 93.039 ° E ﻿ / 22.632 ; 93.039 Shillong Peak Meghalaya Khasi Hills 1,965 6,447 25 ° 31 ′ 55 '' N 91 ° 51 ′ 04 '' E ﻿ / ﻿ 25.532 ° N 91.851 ° E ﻿ / 25.532 ; 91.851 Unnamed peak near Laike Assam Dima Hasao District 1,960 6,430 25 ° 19 ′ 16 '' N 93 ° 27 ′ 11 '' E ﻿ / ﻿ 25.321 ° N 93.453 ° E ﻿ / 25.321 ; 93.453 Betalongchhip Tripura Jampui Hills 930 3,051 23 ° 48 ′ 36 '' N 92 ° 15 ′ 40 '' E ﻿ / ﻿ 23.810 ° N 92.261 ° E ﻿ / 23.810 ; 92.261 Brahmaputra River Basin Brahmaputra river basin See also : Brahmaputra River, List of rivers by length, and List of rivers of Assam Tributaries of the Brahmaputra River in Northeast India : Beki River Bhogdoi River Dhansiri River Dibang River Dihing River Kameng River Kolong Kopili River Lohit River Manas River Sankosh River Subansiri River Teesta River Climate Indian map of Köppen climate classification Northeast India has a subtropical climate that is influenced by its relief and influences from the southwest and northeast monsoons. The Himalayas to the north, the Meghalaya plateau to the south and the hills of Nagaland, Mizoram and Manipur to the east influences the climate. Since monsoon winds originating from the Bay of Bengal move northeast, these mountains force the moist winds upwards, causing them to cool adiabatically and condense into clouds, releasing heavy precipitation on these slopes. It is the rainiest region in the country, with many places receiving an average annual precipitation of 2,000 mm ( 79 in ), which is mostly concentrated in summer during the monsoon season. Cherrapunji, located on the Meghalaya plateau is one of the rainiest place in the world with an annual precipitation of 11,777 mm ( 463.7 in ). Temperatures are moderate in the Brahmaputra and Barak valley river plains which decreases with altitude in the hilly areas. At the highest altitudes, there is permanent snow cover. Temperature Temperatures vary by altitude with the warmest places being in the Brahmaputra and Barak River plains and the coldest at the highest altitudes. It is also influenced by proximity to the sea with the valleys and western areas being close to the sea, which moderates temperatures. Generally, temperatures in the hilly and mountainous areas are generally lower than the plains which lie at a lower altitude. Summer temperatures tend to be more uniform than winter temperatures due to high cloud cover and humidity. In the Brahmaputra and Barak valley river plains, mean winter temperatures vary between 16 to 17 ° C ( 61 to 63 ° F ) while mean summer temperatures are around 28 ° C ( 82 ° F ). The highest summer temperatures occur in the West Tripura plain with Agartala, the capital of Tripura having mean maximum summer temperatures ranging between 33 to 35 ° C ( 91 to 95 ° F ) in April. The highest temperatures in summer occur before the arrival of monsoons and thus eastern areas have the highest temperatures in June and July where the monsoon arrives later than western areas. In the Cachar Plain, located south of the Brahmaputra plain, temperatures are higher than the Brahmaputra plain although the temperature range is smaller owing to higher cloud cover and the monsoons that moderate night temperatures year round. In the mountainous areas of Arunachal Pradesh, the Himalayan ranges in the northern border with India and China experience the lowest temperatures with heavy snow during winter and temperatures that drop below freezing. Areas with altitudes exceeding 2,000 metres ( 6,562 ft ) receive snowfall during winters and have cool summers. Below 2,000 metres ( 6,562 ft ) above sea level, winter temperatures reach up to 15 ° C ( 59 ° F ) during the day with nights dropping to zero while summers are cool, with a mean maximum of 25 ° C ( 77 ° F ) and a mean minimum of 15 ° C ( 59 ° F ). In the hilly areas of Meghalaya, Nagaland, Manipur and Mizoram, winters are cold while summers are cool. The plains in Manipur has colder winter minimums than what is warranted by its elevation owing to being surrounded by hills on all sides. This is due to temperature inversions during winter nights when cold air descends from the hills into the valleys below and its geographic location which prevents winds that bring hot temperatures and humidity from coming into the Manipur plain. Rainfall The southwest monsoon is responsible for bringing 90 % of the annual rainfall to the region. April to late October are the months where most of the rainfall in Northeast India occurs with June and July being the rainiest months. Southern areas are the first to receive the monsoon ( May or June ) with the Brahmaputra valley and the mountainous north receiving later ( later May or June ). In the hilly parts of Mizoram, the closer proximity to the Bay of Bengal causes it to experience early monsoons with June being the wettest season. High risk seismic zone India Plate and other tectonic plates See also : List of earthquakes in India The North Eastern Region of India is a mega-earthquake prone zone caused by active fault planes beneath formed by the convergence of three tectonic plates viz. India Plate, Eurasian Plate and Burma Plate. Historically the region has suffered from two great earthquakes ( M > 8.0 ) -- 1897 Assam earthquake and 1950 Assam - Tibet earthquake -- and about 20 large earthquakes ( 8.0 > M > 7.0 ) since 1897. The 1950 Assam - Tibet earthquake is still the largest earthquake in India. Wildlife Flora Khangchendzonga National Park WWF has identified the entire Eastern Himalayas as a priority Global 200 Ecoregion. Conservation International has upscaled the Eastern Himalaya hotspot to include all the eight states of Northeast India, along with the neighbouring countries of Bhutan, southern China and Myanmar. The region has been identified by the Indian Council of Agricultural Research as a centre of rice germplasm. The National Bureau of Plant Genetic Resources ( NBPGR ), India, has highlighted the region as being rich in wild relatives of crop plants. It is the centre of origin of citrus fruits. Two primitive variety of maize, Sikkim Primitive 1 and 2, have been reported from Sikkim ( Dhawan, 1964 ). Although jhum cultivation, a traditional system of agriculture, is often cited as a reason for the loss of forest cover of the region, this primary agricultural economic activity practised by local tribes supported the cultivation of 35 varieties of crops. The region is rich in medicinal plants and many other rare and endangered taxa. Its high endemism in both higher plants, vertebrates, and avian diversity has qualified it as a biodiversity hotspot. The following figures highlight the biodiversity significance of the region : 51 forest types are found in the region, broadly classified into six major types -- tropical moist deciduous forests, tropical semi evergreen forests, tropical wet evergreen forests, subtropical forests, temperate forests and alpine forests. Out of the nine important vegetation types of India, six are found in the North Eastern Region. These forests harbour 8,000 out of 15,000 species of flowering plants. In floral species richness, the highest diversity is reported from the states of Arunachal Pradesh ( 5000 species ) and Sikkim ( 4500 species ) amongst the North Eastern states. According to the Indian Red Data Book, published by the Botanical Survey of India, 10 percent of the flowering plants in the country are endangered. Of the 1500 endangered floral species, 800 are reported from Northeast India. Most of the North Eastern states have more than 60 % of their area under forest cover, a minimum suggested coverage for the hill states in the country in order to protect from erosion. Northeast India is a part of Indo - Burma hotspot. This hotspot is the second largest in the word, next only to the Mediterranean Basin, with an area 2,206,000 square kilometres ( 852,000 sq mi ) among the 25 identified. Fauna Asiatic Buffalo at Kaziranga National Park One horned rhinoceros at Kaziranga National Park See also : List of amphibians of Northeast India The International Council for Bird Preservation, UK identified the Assam plains and the Eastern Himalaya as an Endemic Bird Area ( EBA ). The EBA has an area of 220,000 km following the Himalayan range in the countries of Bangladesh, Bhutan, China, Nepal, Myanmar and the Indian states of Sikkim, northern West Bengal, Arunachal Pradesh, southern Assam, Nagaland, Manipur, Meghalaya and Mizoram. Because of a southward occurrence of this mountain range in comparison to other Himalayan ranges, this region has a distinctly different climate, with warmer mean temperatures and fewer days with frost, and much higher rainfall. This has resulted in the occurrence of a rich array of restricted - range bird species. More than two critically endangered species, three endangered species, and 14 vulnerable species of birds are in this EBA. Stattersfield et al. ( 1998 ) identified 22 restricted range species, out of which 19 are confined to this region and the remaining three are present in other endemic and secondary areas. Eleven of the 22 restricted - range species found in this region are considered as threatened ( Birdlife International 2001 ), a number greater than in any other EBA of India. WWF has identified the following priority ecoregions in North - East India : Brahmaputra Valley Semi Evergreen Forests Eastern Himalayan Broadleaved Forests Eastern Himalayan Sub-alpine Coniferous Forests India -- Myanmar Pine Forests National Parks See also : Wildlife sanctuaries of India and List of national parks of India National park Location State Area ( km ) Importance Vegetation Namdapha National Park Changlang district Arunachal Pradesh 1,985 Largest protected area in Eastern Himalaya Tropical and subtropical moist broadleaf forests, montane forests Manas National Park Barpeta district Assam 950 UNESCO World Heritage Site Tropical and subtropical moist broadleaf forests Kaziranga National Park Golaghat and Nagaon districts Assam 882 UNESCO World Heritage Site Brahmaputra Valley semi-evergreen forests, Terai - Duar savanna and grasslands Khangchendzonga National Park North Sikkim district Sikkim 850 UNESCO Mixed World Heritage Site and highest altitude wildlife protected area in India Sub-tropical to Alpine, Krummholz ( stunted forest ) Mouling National Park Upper Siang, West Siang and East Siang districts Arunachal Pradesh 483 Tropical to Temperate forests Dibru - Saikhowa National Park Dibrugarh and Tinsukia districts Assam 350 Brahmaputra Valley semi-evergreen forests Balphakram National Park South Garo Hills district Meghalaya 220 Sub-tropical evergreen deciduous forests Intangki National Park Peren district Nagaland 202 Temperate evergreen forests Nameri National Park Sonitpur district Assam 200 Brahmaputra Valley semi-evergreen forests Murlen National Park Champhai district Mizoram 100 Montane sub-tropical semi-evergreen forest Orang National Park Darrang and Sonitpur Assam 79 Eastern seasonal swamp forests, Eastern Himalayan moist mixed deciduous forests, eastern wet alluvial grasslands Phawngpui National Park Lawngtlai district Mizoram 50 Temperate forests Nokrek National Park West Garo Hills district Meghalaya 48 Tropical and subtropical moist broadleaf forests Sirohi National Park Ukhrul district Manipur 41 Mizoram - Manipur - Kachin rainforest Keibul Lamjao National Park Bishnupur district Manipur 40 World 's only floating National park Phumdi ( floating marshes ) Bison ( Rajbari ) National Park South Tripura district Tripura 32 Tropical semi-evergreen and moist deciduous forests Clouded Leopard National Park Sepahijala district Tripura 5 Tropical and subtropical moist broadleaf forests State Symbols Main article : List of symbols of Indian states and territories Arunachal Pradesh Assam Manipur Meghalaya Animal Mithun ( Bos frontalis ) Indian rhinoceros ( Rhinoceros unicornis ) Sangai ( Rucervus eldii eldii ) Clouded leopard ( Neofelis nebulosa ) Bird Hornbill ( Buceros bicornis ) White - winged duck ( Asarcornis scutulata ) Mrs. Hume 's pheasant ( Syrmaticus humiae ) Hill myna ( Gracula religiosa ) Flower Foxtail orchid ( Rhynchostylis retusa ) Foxtail orchid ( Rhynchostylis retusa ) Siroi lily ( Lilium mackliniae ) Lady 's Slipper Orchid ( Paphiopedilum insigne ) Tree Hollong ( Dipterocarpus macrocarpus ) Hollong ( Dipterocarpus macrocarpus ) Uningthou ( Phoebe hainesiana ) Gamhar ( Gmelina arborea ) Mizoram Nagaland Sikkim Tripura Animal Himalayan serow ( Capricornis thar ) Mithun ( Bos frontalis ) Red panda ( Ailurus fulgens ) Phayre 's leaf monkey ( Trachypithecus phayrei ) Bird Mrs. Hume 's pheasant ( Syrmaticus humiae ) Blyth 's tragopan ( Tragopan blythii ) Blood pheasant ( Ithaginis cruentus ) Green imperial pigeon ( Ducula aenea ) Flower Red Vanda ( Renanthera imschootiana ) Tree rhododendron ( Rhododendron arboreum ) Noble dendrobium ( Dendrobium nobile ) Indian rose chestnut ( Mesua ferrea ) Tree Indian rose chestnut ( Mesua ferrea ) Alder ( Alnus nepalensis ) Rhododendron ( Rhododendron niveum ) Agarwood ( Aquillaria agallocha ) Demographics Main article : 2011 Census of India The total population of Northeast India is 46 million with 68 percent of that living in Assam alone. Assam also has a higher population density of 397 persons per km2 than the national average of 382 persons per km2. The literacy rates in the states of the Northeastern region, except those in Arunachal Pradesh and Assam, are higher than the national average of 74 percent. As per 2011 census, Meghalaya recorded the highest population growth of 27.8 percent among all the states of the region, higher than the national average at 17.64 percent ; while Nagaland recorded the lowest in the entire country with a negative 0.5 percent. State Population Males Females Sex Ratio Literacy % Rural Population Urban Population Area ( km2 ) Density ( / km2 ) Arunachal Pradesh 1,383,727 713,912 669,815 938 65.38 870,087 227,881 83,743 17 Assam 31,205,576 15,939,443 15,266,133 958 72.19 23,216,288 3,439,240 78,438 397 Manipur 2,570,390 1,290,171 1,280,219 992 79.21 1,590,820 575,968 22,327 122 Meghalaya 2,966,889 1,491,832 1,475,057 989 74.43 1,864,711 454,111 22,429 132 Mizoram 1,097,206 555,339 541,867 976 91.33 447,567 441,006 21,081 52 Nagaland 1,978,502 1,024,649 953,853 931 79.55 1,647,249 342,787 16,579 119 Sikkim 610,577 323,070 287,507 890 81.42 480,981 59,870 7,096 86 Tripura 3,673,917 1,874,376 1,799,541 960 87.22 2,653,453 545,750 10,486 350 Largest cities by population Main article : List of cities in India by population According to 2011 Census of India, the largest cities in Northeast India are Rank City Type State Population Rank City Type State Population Guwahati UA Assam 1,260,419 9 Jorhat UA Assam 153,249 Agartala City Tripura 522,613 10 Nagaon UA Assam 147,137 Imphal UA Manipur 414,288 11 Tinsukia UA Assam 125,637 Dimapur City Nagaland 379,769 12 Dhubri UA Assam 109,234 5 Shillong UA Meghalaya 354,325 13 Tezpur UA Assam 100,477 6 Aizawl City Mizoram 291,822 14 Kohima UA Nagaland 100,000 7 Silchar UA Assam 228,985 15 Gangtok City Sikkim 98,658 8 Dibrugarh UA Assam 154,019 16 Itanagar City Arunachal Pradesh 95,650 UA : Urban Agglomeration Languages Northeast India constitutes a single linguistic region within the Indian national context, with about 220 languages in multiple language families ( Indo - European, Trans - Himalayan / Sino - Tibetan, Kra -- Dai, Austroasiatic, as well as some creole languages ) that share a number of features that set them apart from most other areas of the Indian subcontinent ( such as alveolar consonants rather than the more typical dental / retroflex distinction ). Assamese, an Indo - Aryan language spoken mostly in the Brahmaputra Valley, developed as a lingua franca for many speech communities. Assamese - based pidgin / creoles have developed in Nagaland ( Nagamese ) and Arunachal ( Nefamese ), though their use has been on a decline in recent times. The Austro - Asiatic family is represented by the Khasi, Jaintia and War languages of Meghalaya. A small number of Tai -- Kadai languages ( Ahom, Tai Phake, Khamti, etc. ) are also spoken. Trans - Himalayan / Sino - Tibetan is represented by a number of languages that differ significantly from each other, some of which are : Bodo, Rabha, Karbi, Mising, Tiwa, Deori, Biate etc. ( Assam ) ; Garo, Biate ( Meghalaya ) Ao, Angami, Sema, Lotha, Konyak etc. ( Nagaland ) ; Mizo, Hmar, Chakma ( Mizoram ) ; Hrusso, Tanee, Nisi, Adi, Abor, Nocte, Apatani, Misimi etc. ( Arunachal ). Meitei is the official language in Manipur, the dominant language of the Imphal Valley ; while `` Naga '' languages such as Poumai, Mao, Maram, Rongmei ( Kabui ) and Tangkul, and Kuki - Chin languages such as Thadou, Hmar, Simte and Paite predominate in individual hill areas of the state. Among other Indo - Aryan languages, Bengali is spoken in South Assam in the Barak Valley. Besides the Sino - Tibetan Tripuri language, Bengali is a majority language in Tripura. Nepali, an Indo - Aryan language, is dominant in Sikkim, besides the Sino - Tibetan languages Limbu, Bhutia and Lepcha. Bengali was the official language of Colonial Assam for about forty years from the 1830s. Official languages See also : Languages with official status in India State Official Languages Arunachal Pradesh Hindi, English Assam Assamese, Bengali ( in the Barak Valley ), Bodo ( in Bodoland ) Manipur Meiteilon Meghalaya Khasi, Garo, English Mizoram Mizo, English Nagaland English Sikkim Nepali, English Tripura Bengali, Kokborok Etymology of state names See also : Nomenclature of States in North East India and List of Indian state and union territory name etymologies Name of state Origin Literal meaning Arunachal Pradesh Sanskrit Land of the rising sun Assam Sanskrit Asama ( `` unequalled '', `` peerless '', etc. ) Manipur Sanskrit Land abundant with jewels, adopted in the 18th century Meghalaya Sanskrit Abode of the clouds, coined by Shiba P. Chatterjee Mizoram Mizo language Land of the Mizo people Nagaland English Land of the Naga people Sikkim Limbu Language New House -- Derived from the word `` Sukhim '', `` Su '' meaning new and `` Khim '' meaning house Tripura Kokborok Sanskrit version of native names : Tripra, Tuipura, Twipra, Tippera etc. Endangered languages Main article : List of endangered languages in India Given the diverse population in the region with only a few widely spoken ones recognised as the official languages by both the state and central governments, a large number of languages from the North Eastern Region of India have become vulnerable. Without proper teaching and preservation efforts, the already underdeveloped literature of the endangered languages are on the verge of extinction. Additionally, the younger generation are rapidly adopting the widely spoken languages to secure employment and livelihood. Religions Religion in Northeast India ( 2011 ) Hinduism ( 54.02 % ) Islam ( 25.05 % ) Christianity ( 17.24 % ) Buddhism ( 1.37 % ) Jainism ( 0.07 % ) Sikhism ( 0.07 % ) Other religions ( 1.97 % ) Not Stated ( 0.19 % ) Religious population in North Eastern Region, according to 2011 Census of India State Hinduism Islam Christianity Buddhism Jainism Sikhism Other Religions Religion Not Stated Arunachal Pradesh 401,876 27,045 418,732 162,815 771 3,287 362,553 6,648 Assam 19,180,759 10,679,345 1,165,867 54,993 25,949 20,672 27,118 50,873 Manipur 1,181,876 239,836 1,179,043 7,084 1,692 1,527 233,767 10,969 Meghalaya 342,078 130,399 2,213,027 9,864 627 3,045 258,271 9,578 Mizoram 30,136 14,832 956,331 93,411 376 286 808 1,026 Nagaland 173,054 48,963 1,739,651 6,759 2,655 1,890 3,214 2,316 Sikkim 352,662 9,867 60,522 167,216 314 1,868 16,300 1,828 Tripura 3,063,903 316,042 159,882 125,385 860 1,070 1,514 5,261 Total 24,726,344 11,466,329 7,893,055 627,527 33,244 33,645 903,545 88,499 Ethnic groups Northeast India has over 220 ethnic groups and equal number of dialects in which Bodo form the largest indegenous ethnic group. The hills states in the region like Arunachal Pradesh, Meghalaya, Mizoram and Nagaland are predominantly inhabited by tribal people with a degree of diversity even within the tribal groups. The region 's population results from ancient and continuous flows of migrations from Tibet, Indo - Gangetic India, the Himalayas, present Bangladesh and Myanmar. Major communities Adivasi Anāl Naga Assamese Bahun Bhutia Bishnupriya Biate Bodo Chakma Chhetri Chorei Deori Dimasa Garo Gurung Hajong Hmar Jamatia Karbi Khasi Khampti Koch Kom Kuki Lepcha Limbu Mao Maram Meitei Mishing Mizo Monsang Mishmi Naga Nepali Noatia Paite Pnar Poumai Purvottar maithili Rabha Ranglong ( Langrong ) Reang Rongmei Singpho Sylheti Tamang Tangkhul Tiwa Tripuri Zomi people ( Paite, Vaiphei, Zou, Teddim, Simte, Gangte ) British India map of Northeast India by ethnicity, 1891 A Naga warrior in 1960 Bishnupuriya bride Shad suk Mynsiem, a Khasi festival Aka tribe, Arunachal Pradesh Mizo school girls Women selling fruits in Senapati, Manipur Princess of Sikkim in traditional royal dress Culture Cuisines Main article : Indian cuisine State Staple diet Popular dishes Related article Arunachal Pradesh Rice, fish, meat, leaf vegetables Thukpa, momo, apong ( rice beer ) Cuisine of Arunachal Pradesh Assam Rice, fish, meat, leaf vegetable Assam tea, khar, tenga, pura, pitha, tamul ( betel nut ) -- paan, rice beer Assamese cuisine Manipur Rice, fish, local vegetables Eromba, u-morok, singju, ngari ( fermented fish ), kangshoi Cuisine of Manipur Meghalaya Rice, spiced meat, fish Jadoh, ki kpu, minil, nakham ( dried fish ), momo, bamboo shoot Cuisine of Meghalaya Mizoram Rice, fish, meat Bai, bekang ( fermented soya beans ), sa - um ( fermented pork ), sawhchiar Nagaland Rice, meat, stewed or steamed vegetables fermented bamboo shoot, smoked pork and beef, axone, bhut jolokia Naga cuisine Sikkim Rice, meat, dairy products Thukpa, momo, sha Phaley, gundruk, sinki, sel roti Sikkimese cuisine Tripura Rice, fish, meat Fish stew, bamboo shoot, fermented fish Tripuri cuisine Nagamese meal Bhangui - ethnic food of Tripura Paknam ( Manipur ) Smoked freshwater fish ( Manipur ) Thukpa - a popular Northeast India cuisine North Sikkim meal Assamese thali Red rice with pork ( Arunachal Pradesh ) Arts Sattriya ( from Assam ) and Manipuri dance ( from Manipur ) have been listed as classical dances of India. Besides these, all tribes in the Northeast India have their own folk dances associated with their religion and festivals. The tribal heritage in the region is rich with the practice of hunting, land cultivation and indigenous crafts. The rich culture is vibrant and visible with the traditional attires of each community. All states in Northeast India share the handicrafts of bamboo and cane, wood carving, making traditional weapons and musical instruments, pottery and handloom weaving. Traditional tribal attires are made of thick fabrics primarily with cotton. Assam silk is a famous industry in the region. State Traditional Performing Arts Traditional Visual Arts Traditional Crafts Arunachal Pradesh Wancho dances, Idu Mishmi dance, Digaru Mishmi Buiya dance, Khampti dance, Ponung dance, Sadinuktso Cane and bamboo, cotton and wool weaving, wood carving, blacksmithy ( hand tools, weapons, ornaments, dishes, sacred bells and smoking pipes ) Assam Sattriya, Bagurumba, Bihu dance, Bhaona ( For more see Music of Assam ) Hastividyarnava ( For more see Fine Arts of Assam ) Cane and bamboo, bell metal and brass, silk, toy and mask making, pottery and terracotta, jewellery, musical instruments making, boat making, paints Manipur Manipuri dance ( Ras Lila ), Kartal Cholam, Manjira Cholom, Khuba Kishei, Pung Cholam, Lai - Haraoba Cotton textile, bamboo crafts ( hats, baskets ), pottery Meghalaya Nongkrem, Shad suk, Behdienkhlam, Wangala, Lahoo dance ( For more see Music of Meghalaya ) Making hand tools and weapons, musical instruments ( drums ), cane and bamboo work, weaving traditional attires, jewellery making ( gold, coral, glass ), wall engravings, wood carving Mizoram Cheraw, Khuallam, Chheih - Lam, Chai, Rallu - Lam, Solakia, Sarlamkai, Par - lam, Sakei Lu Lam ( For more see Music of Mizoram ) Traditional hand tools, weapons and textile work, bamboo and cane handicrafts Nagaland Zeliang dance, war dance, Nruirolians ( cock dance ) ( For more see Music of Nagaland ) Cane and bamboo crafts, traditional hand tools, weapons and textile work, wood carving, pottery, ornaments for traditional attire, musical instruments ( drum and trumpet ) Sikkim Chu Faat dance, Lu Khangthamo, Gha To Kito, Rechungma, Maruni, Tamang Selo, Singhi Chaam, Yak Chaam, Khukuri dance, Rumtek Chaam ( mask dance ) ( See also Music of Sikkim ) Thangka ( showcasing Buddhist teachings on cotton canvas using vegetable dyes ) Handmade paper, carpet making, woollen textile, wood carving Tripura Goria dance, Jhum dance, Lebang dance, Mamita dance, Mosak sulmani dance, Hojagiri dance, Bizhu dance, Wangala, Hai - hak dance, Sangrai dance, Owa dance Cane and bamboo, weaving and handloom, sitalpati ( mat making ), wood carving, string and wind musical instruments Sattriya dance ( Assam ) Nyokum festival of Nyishi tribe ( Arunachal Pradesh ) Manipuri dance Bagurumba dance of Bodo tribe ( Assam ) Wangala dance of Garo tribe ( Assam, Meghalaya ) Dance of Angami tribe ( Nagaland ) Hojagiri dancers ( Tripura ) Students performing traditional dance at Jorethang ( Sikkim ) Administration and political disputes International borders management McMahon Line and manned by Indo - Tibetan Border Police and Special Frontier Force with China along Sikkim and Arunachal Pradesh India - Bangladesh border and crossings manned by Border Security Force along Assam, Meghalaya, Tripura and Mizoram India -- Myanmar barrier, crossings and Look - East connectivity manned by Assam Rifles and Indian Army along Arunachal Pradesh, Nagaland, Manipur and Mizoram India - Bhutan borders manned by Sashastra Seema Bal along Sikkim, Assam and Arunachal Pradesh India - Nepal border manned by Sashastra Seema Bal along Sikkim Pan-states development authorities Ministry for Development of North Eastern Region ( DoNER ) North Eastern Council Development and connectivity projects NE road, rail, air services, water, power and tourism projects Look - East connectivity projects with ASEAN and SAARC States and sub-divisions Main articles : Administrative divisions of India and List of districts in India State Code Capital Districts Sub-division Type Number of Subdivisions Arunachal Pradesh IN - AR Itanagar 20 Circle 149 Assam IN - AS Dispur 33 Sub-division 78 Manipur IN - MN Imphal 9 Sub-division 38 Meghalaya IN - ML Shillong 11 Community Development Block 39 Mizoram IN - MZ Aizawl 8 Community Development Block 22 Nagaland IN - NL Kohima 11 Circle 33 Sikkim IN - SK Gangtok Sub-division 9 Tripura IN - TR Agartala 8 Mahakuma 23 Autonomous Administrative Divisions in North Eastern States State Autonomous Division Establishment Assam Bodoland Territorial Area Districts February 2003 Dima Hasao district February 1970 Karbi Anglong district February 1970 Mising Autonomous Council 1995 Rabha Hasong Autonomous Council 1995 Manipur Churachandpur Autonomous District Council 1971 Chandel Autonomous District Council 1971 Senapati Autonomous District Council 1971 Sadar Hills Autonomous District Council 1971 Tamenglong Autonomous District Council 1971 Ukhrul Autonomous District Council 1971 Meghalaya Garo Hills Autonomous District Council Jaintia Hills Autonomous District Council July 2012 Khasi Hills Autonomous District Council Mizoram Chakma Autonomous District Council April 1972 Lai Autonomous District Council April 1972 Mara Autonomous District Council May 1971 Tripura Tripura Tribal Areas Autonomous District Council January 1982 Main article : Autonomous administrative divisions of India Government The northeastern states, having 3.8 % of India 's total population, are allotted 25 out of a total of 543 seats in the Lok Sabha. This is 4.6 % of the total number of seats. State Chief Minister Governor High Court Chief Justice Arunachal Pradesh Pema Khandu B.D. Mishra Guwahati High Court ( Itanagar Bench ) Justice Ajit Singh Assam Sarbananda Sonowal Professor Jagdish Mukhi Guwahati High Court Justice Ajit Singh Manipur Nongthombam Biren Singh Najma Heptulla Manipur High Court Justice N. Kotiswar Singh Meghalaya Conrad Sangma Ganga Prasad Meghalaya High Court Justice Dinesh Maheshwari Mizoram Lal Thanhawla Lt. General ( Retd. ) Nirbhay Sharma Guwahati High Court ( Aizawl Bench ) Justice Ajit Singh Nagaland Neiphiu Rio Shri Padmanabha Balakrishna Acharya Guwahati High Court ( Kohima Bench ) Justice Ajit Singh Sikkim Pawan Kumar Chamling Shri Shriniwas Dadasaheb Patil Sikkim High Court Justice Satish K. Agnihotri Tripura Biplab Kumar Deb Shri Tathagata Roy Tripura High Court Justice Tinlianthang Vaiphei 21st century separatist unrest Main article : Insurgency in Northeast India In 1947 Indian independence and partition resulted in the North East becoming a landlocked region. This exacerbated the isolation that has been recognised, but not studied. East Pakistan controlled access to the Indian Ocean. The mountainous terrain has hampered the construction of road and railways connections in the region. The militant groups have formed an alliance to fight against the governments of India, Bhutan, and Myanmar, and now use the term `` Western Southeast Asia '' ( WESEA ) to refer to the region. The separatist groups include the Kangleipak Communist Party ( KCP ), Kanglei Yawol Kanna Lup ( KYKL ), People 's Revolutionary Party of Kangleipak ( PREPAK ), People 's Revolutionary Party of Kangleipak - Pro ( PREPAK - Pro ), Revolutionary People 's Front ( RPF ) and United National Liberation Front ( UNLF ) of Manipur, Hynniewtrep National Liberation Council ( HNLC ) of Meghalaya, Kamatapur Liberation Organization ( KLO ), which operates in Assam and North Bengal, National Democratic Front of Bodoland and ULFA of Assam and the National Liberation Front of Tripura ( NLFT ). Malom Massacre Some political groups have argued for creating states independent of India. On 2 November 2000, in Malom, a town in the Imphal Valley of Manipur, ten civilians were shot and killed while waiting at a bus stop. The incident, known as the `` Malom Massacre '', was allegedly committed by the Assam Rifles, one of the Indian Paramilitary forces operating in the state. This incident resulted in continuing unrest in the area. Economy The Ministry of Development of North Eastern Region ( MDoNER ) is the deciding body under Government of India for socio - economic development in the region. The North Eastern Council under MDoNER serves as the regional governing body for Northeast India. The North Eastern Development Finance Corporation Ltd. ( NEDFi ) is a Public Limited Company providing assistance to micro, small, medium and large enterprises within the north eastern region ( NER ). Other organisations under MDoNER include North Eastern Regional Agricultural Marketing Corporation Limited ( NERAMAC ), Sikkim Mining Corporation Limited ( SMC ) and North Eastern Handlooms and Handicrafts Development Corporation ( NEHHDC ). Industries Agriculture The economy is agrarian. Little land is available for settled agriculture. Along with settled agriculture, jhum ( slash - and - burn ) cultivation is still practised by a few indigenous groups of people. The inaccessible terrain and internal disturbances has made rapid industrialisation difficult in the region. Jhum cultivation Tea garden in Darrang, Assam Paddy fields in Manipur Oil palm plantation in Mizoram Terrace farming in Nagaland Local vegetables in Assam Tourism See also : Tourism in North East India and Tourism in India by state Living Root Bridges Living root bridge, Meghalaya Northeast India is also the home of many Living root bridges. In Meghalaya, these can be found in the southern Khasi and Jaintia Hills. They are still widespread in the region, though as a practice they are fading out, with many examples having been destroyed in floods or replaced by more standard structures in recent years. Living root bridges have also been observed in the state of Nagaland, near the Indo - Myanmar border. Transportation Air Inside Guwahati airport ( Assam ) Agartala airport ( Tripura ) Main article : List of airports in India States in the North Eastern Region are well connected by air - transport conducting regular flights to all major cities in the country. The states also own several small airstrips for military and private purposes which may be accessed using Pawan Hans helicopter services. The region currently has two international airpots viz. Lokapriya Gopinath Bordoloi International Airport and Bir Tikendrajit International Airport conducting flights to Thailand, Myanmar, Nepal and Bhutan. While the airport in Sikkim is under - construction, Bagdogra Airport ( IATA : IXB, ICAO : VEBD ) remains the closest domestic airport to the state. Public airports operational in Northeast India State Airport City IATA Code Arunachal Pradesh Itanagar Airport ( Under construction ) Itanagar Assam Dibrugarh Airport Dibrugarh DIB Jorhat Airport Jorhat JRH Lokpriya Gopinath Bordoloi International Airport Guwahati GAU Lilabari Airport Lakhimpur IXI Rupsi Airport Dhubri RUP Silchar Airport Silchar IXS Tezpur Airport Tezpur TEZ Manipur Bir Tikendrajit International Airport Imphal IMF Meghalaya Baljek Airport Tura VETU ( ICAO ) Shillong Airport Shillong SHL Mizoram Lengpui Airport Aizawl AJL Nagaland Dimapur Airport Dimapur DMU Sikkim Pakyong Airport ( Under construction ) Gangtok VEPY ( ICAO ) Tripura Agartala Airport Agartala IXA Railway Northeast India railway Main article : Northeast Frontier Railway zone Railway in Northeast India is delineated as Northeast Frontier Railway zone of Indian Railways. The regional network is poor with the states of Manipur, Meghalaya, Mizoram, Nagaland and Sikkim remaining almost disconnected till date ( 11 June 2017 ). Projects are underway to extend the network and connect all the capital cities in the region. Look East policy In the 21st century, there has been recognition among policy makers and economists of the region that the main stumbling block for economic development of the Northeastern region is the disadvantageous geographical location. It was argued that globalisation propagates deterritorialisation and a borderless world which is often associated with economic integration. With 98 percent of its borders with China, Myanmar, Bhutan, Bangladesh and Nepal, Northeast India appears to have a better scope for development in the era of globalisation. As a result, a new policy developed among intellectuals and politicians that one direction the Northeastern region must be looking to as a new way of development lies with political integration with the rest of India and economic integration with the rest of Asia, with East and Southeast Asia in particular, as the policy of economic integration with the rest of India did not yield much dividends. With the development of this new policy the Government of India directed its Look East policy towards developing the Northeastern region. This policy is reflected in the Year End Review 2004 of the Ministry of External Affairs, which stated that : `` India 's Look East Policy has now been given a new dimension by the UPA Government. India is now looking towards a partnership with the Association of Southeast Asian Nations ASEAN countries, both within BIMSTEC and the India - ASEAN Summit dialogue as integrally linked to economic and security interests, particularly for India 's East and North East region. '' See also Geography portal Asia portal Southeast Asia portal India portal Himalaya region portal Assam silk Assam tea Assamese Brahmins Battle of the Tennis Court Brahmaputra River Brahmaputra Valley Film Festival Eastern Fare Music Foundation Kamrupi Brahmins Laskar Committee Report Ledo Road ( Stillwell Road ) List of Christian denominations in Northeast India List of educational institutions in Shillong Literature from North East India Mizo music Music of Assam Music of Meghalaya Music of Nagaland Music of Sikkim Northeast India International Travel Mart NorthEast United FC Political integration of India References Citations Jump up ^ `` Indian cities by population '' ( PDF ). ^ Jump up to : `` Problems of border areas in Northeast India '' ( PDF ). Jump up ^ `` North Eastern Council ''. Archived from the original on 15 April 2012. Retrieved 25 March 2012. ^ Jump up to : `` Integration of Sikkim in North Eastern Council ''. Times of India. 10 December 2002. 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Jump up ^ http://india.gov.in/my-governmentra/whos-who/chief-ministers Jump up ^ http://india.gov.in/my-government/whos-who/governors Jump up ^ Seventh Kamal Kumari Memorial Lecture. Jump up ^ `` 11 rebel groups call for Republic Day boycott ''. The Times Of India. Retrieved 9 September 2014. Jump up ^ `` NE rebels call general strike on I - Day ''. The Sangai Express. Archived from the original on 9 September 2014. Retrieved 9 September 2014. Jump up ^ Anjuman Ara Begum ( 3 November 2010 ). `` AFSPA and Unsolved massacres in Manipur ''. Twocircles.net. Retrieved 21 October 2012. Jump up ^ Imphal Free Press. `` Malom Massacre horror relived 13 years later ''. Archived from the original on 12 November 2013. Retrieved 11 November 2013. Jump up ^ Nilanjana S. Roy ( 8 February 2011 ). `` Torchbearers for Victims in a Violent Land ''. The New York Times. Archived from the original on 22 October 2012. Retrieved 8 May 2011. 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Jump up ^ Thongkholal Haokip, India 's Northeast Policy : Continuity and Change Archived 28 April 2017 at the Wayback Machine., Man and Society -- A Journal of North - East Studies, Vol. VII, Winter 2010, pp. 86 -- 99. Jump up ^ Year End Review 2004, Ministry of External Affairs, Government of India. New Delhi. Sources cited Casson, Lionel ( 1989 ). The Periplus Maris Erythraei : Text With Introduction, Translation, and Commentary. Princeton University Press. ISBN 0 - 691 - 04060 - 5. Dikshit, K. ; Dikshit, Jutta ( 2014 ). `` Weather and Climate of North -- East India ''. North -- East India : Land, People and Economy. Springer Netherlands. pp. 149 -- 173. ISBN 978 - 94 - 007 - 7054 - 6. Grierson, George A. ( 1967 ) ( 1903 ). `` Assamese ''. Linguistic Survey of India. Volume V, Indo - Aryan family. Eastern group. New Delhi : Motilal Banarasidass. pp. 393 -- 398. Lahiri, Nayanjot ( 1991 ). Pre-Ahom Assam : Studies in the Inscriptions of Assam between the Fifth and the Thirteenth Centuries AD. Munshiram Manoharlal Publishers Pvt Ltd. Masica, Colin P. ( 1993 ), Indo - Aryan Languages, Cambridge University Press Moral, Dipankar ( 1997 ), `` North - East India as a Linguistic Area '' ( PDF ), Mon - Khmer Studies, 27 : 43 -- 53 Sharma, Benudhar, ed. ( 1972 ), An Account of Assam, Gauhati : Assam Jyoti Taher, M ( 2001 ), `` Assam : An Introduction '', in Bhagawati, AK, Geography of Assam, New Delhi : Rajesh Publications, pp. 1 -- 17 Watters, Thomas ( 1905 ). Davids, T.W. Rhys ; Bushell, S. W, eds. On Yuan Chwang 's Travels in India. 2. London : Royal Asiatic Society. Retrieved 29 January 2013. Nandy, SN ( 2014 ), `` Agro-Economic Indicators -- A Comparative Study of North - Eastern States of India '', Journal of Land and Rural Studies van Driem, George ( 2012 ), `` '' Glimpses of the Ethnolinguistic Prehistory of Northeastern India. `` '', in Huber, Toni, Origins and Migrations in the Extended Eastern Himalayas, Leiden : Brill Official sites Wikimedia Commons has media related to North East India. 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Question: the states of manipur tripura and meghalaya were formed in
Answer: 1971