Terai

Terai
Barunkhanal · CC BY-SA 3.0 · source
Name	Terai
Location	South Asia

Terai is a lowland region at the foothills of the Himalayas spanning parts of India and Nepal, known for its wetlands, grasslands, and fertile floodplains. The region lies adjacent to the Siwalik Hills and serves as a transition between the Indo-Gangetic Plain and montane ecosystems, influencing patterns of settlement linked to cities such as Lucknow, Patna, Gorakhpur, Biratnagar, and Bharatpur. Terai landscapes have shaped political boundaries in treaties like the Sugauli Treaty and infrastructural corridors including the East–West Highway (Nepal) and railway lines connecting Kolkata and Kathmandu.

Etymology and naming

The name derives from words in Indo-Aryan languages and appears in historical texts associated with the Mughal Empire, Maratha Empire, Delhi Sultanate, and regional chronicles of the Khasa Kingdom and Malla dynasty. British colonial cartographers and administrators of the East India Company and the British Raj adopted local toponyms recorded during surveys by the Survey of India and explorers such as George Everest and Alexander Cunningham. Nineteenth-century works by scholars in the Asiatic Society of Bengal and legal documents ratified after the Anglo-Nepalese War formalized the term in maps used by the Government of India and princely states like Uttar Pradesh and Bihar.

Geography and boundaries

The region occupies the southern edge of the Himalaya system and the northern fringe of the Ganges Basin, bounded by the Siwalik Range to the north and the Gangetic Plain to the south, with major rivers such as the Ganges, Gandak River, Koshi River, Ravi River, and Sarayu River crossing its floodplains. Administrative divisions encompassing the area include Indian states Bihar, Uttar Pradesh, West Bengal, Uttarakhand, and the Province No. 1 and Madhesh Province in Nepal, and urban centers such as Varanasi, Patna, Ranchi, and Haldia anchor regional networks. Transboundary passages link to international corridors like the Asian Highway Network and river treaties negotiated between India–Nepal relations and riparian commissions influenced by the Indus Waters Treaty precedents.

Climate and ecology

The Terai experiences a subtropical monsoon climate influenced by the Bay of Bengal branch of the Southwest Monsoon, with annual precipitation patterns recorded by meteorological stations in New Delhi, Kathmandu, Patna, and Kolkata. Vegetation historically included Sal (Shorea robusta)-dominated forests, alluvial grasslands, and freshwater wetlands that supported species catalogued by naturalists such as Salim Ali and E. H. Aitken. Faunal assemblages have included populations of Bengal tiger, Asian elephant, greater one-horned rhinoceros, Ganges river dolphin, and migratory birds tracked by organizations like the Royal Society for the Protection of Birds and the Wetlands International network. Conservation science in the region draws on methodologies from institutions such as the World Wildlife Fund, Wildlife Institute of India, and the IUCN.

Human geography and demographics

Populations in the Terai reflect centuries of migration tied to kingdoms like the Malla dynasty, colonial settlement schemes by the British Raj, and postcolonial movements related to states including Nepal and India. Ethnolinguistic groups present include peoples speaking Maithili, Bhojpuri, Awadhi, Tharu dialects, and Bengali, with cultural institutions tied to festivals observed in Varanasi, Kathmandu Durbar Square, and regional fairs such as the Chhath Puja. Urbanization has expanded in municipalities such as Birgunj, Gorakhpur, Siliguri, Dhangadhi, and Butwal while land tenure reforms and policies enacted by governments like the Government of Nepal and the Government of India have affected patterns first formalized under the Zamindari system and later modified by legislation inspired by models in the Green Revolution era.

History and land use

Historical exploitation and land-use change in the Terai include clearing for agriculture during the Mughal Empire and later the British Raj campaigns against malaria promoted by medical figures like Ronald Ross, alongside infrastructural projects such as canalization linked to the Ganges Canal and colonial drainage schemes. Post-independence development initiatives by administrations in New Delhi and Kathmandu encouraged migration, settlement, and agro-industrial expansion connected to enterprises such as the Indian Farmers Fertiliser Cooperative and agro-processing hubs in Muzaffarpur and Ranchi. Conflict episodes involving movements like the Nepalese Civil War and political arrangements following the Treaty of Sugauli have influenced land claims and tenure upheld in courts including the Supreme Court of India and the Supreme Court of Nepal.

Economy and agriculture

The Terai is a major production zone for crops such as rice, wheat, sugarcane, and jute, with supply chains linking to ports like Kolkata Port and agro-industries in regional markets such as Patna and Varanasi. Mechanization and inputs promoted during the Green Revolution involved agencies such as the Indian Council of Agricultural Research and international actors like the International Maize and Wheat Improvement Center and the Food and Agriculture Organization. Trade corridors connect manufacturing and service centers in Kolkata, Delhi, and Kathmandu, while remittances from labor migrants using recruiters licensed under regulations comparable to those administered by the International Labour Organization affect household economies. Financial inclusion and microcredit programs from banks including the State Bank of India and NGOs modeled on Grameen Bank approaches operate across rural cooperatives.

Conservation and environmental challenges

Conservation in the Terai is pursued through protected areas such as Chitwan National Park, Valmiki National Park, Dudhwa National Park, and Bardia National Park, often in collaboration with organizations like the UNESCO World Heritage program and the IUCN. Environmental challenges include deforestation driven by expansion of plantations, habitat fragmentation from road projects like the Mahendra Highway, water pollution affecting the Ganges River and tributaries, and human-wildlife conflict involving agencies such as the National Tiger Conservation Authority. Climate change impacts monitored by the Intergovernmental Panel on Climate Change interact with riverine flooding managed through basin planning by bodies inspired by the Brahmaputra Board model, while transboundary conservation initiatives involve accords comparable to Convention on Biological Diversity commitments and partnerships with conservation NGOs such as Conservation International.

Category:Regions of South Asia