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Industrial regions and corridors

Industry and transport in India · Part 2 / 4 · Fact-checked on 8 November 2026 · how we check

Written with AI from the sources listed at the bottom of this page, then fact-checked by a separate AI.

The eight major industrial regions and what first drew industry to each, minor regions and why industry stays concentrated, the industrial corridors and NICDC, export zones, SEZs, parks and clusters, and the pollution cost of industry from Bhopal (1984) to the Red–Orange–Green–White categories.

Part 1 explained why a single factory settles where it does. This part steps back to look at the map as a whole. Factories in India are not spread evenly: they gather in a limited number of belts around big ports, mineral fields and large cities, while wide stretches of the country have very little modern industry. Geographers call such a belt an industrial region. Knowing where these regions lie, and what first drew industry there, explains much of India's uneven development. The part then turns to the newer tools by which the government tries to redraw this map, industrial corridors, special zones and parks, and ends with the price that industrial growth has paid in pollution. Throughout, the factors of location of industry from Part 1 are the key to reading the map.

An industrial region is an area where many factories, workers and related services sit close together and depend on one another. Geographers pick out such regions by measures like the number of registered factories, the share of the workforce employed in industry and the value of industrial output. On this basis eight major industrial regions are usually named: Mumbai–Pune, the Hugli belt, Bengaluru–Chennai, Gujarat, Chota Nagpur, Visakhapatnam–Guntur, Gurugram–Delhi–Meerut and Kollam–Thiruvananthapuram. Below them come smaller minor regions and single industrial districts. Each major region grew because some advantage came first, such as a port, a mineral field, cheap power or a big market, and that start then attracted suppliers, skilled labour, banks and transport, so that growth fed on itself.

The two western regions grew on cotton and later on oil. The Mumbai–Pune region began with the cotton mills of the 1850s, helped by raw cotton from the black-soil Deccan, a damp coastal climate and the port. Power from the hydroelectric stations built on the edge of the Western Ghats in the early twentieth century let it grow further, and the discovery of oil and gas at Mumbai High in the 1970s added refineries and petrochemicals. Today it also has engineering, chemicals, pharmaceuticals and vehicle plants, with Pune a major automobile centre. The Gujarat region, centred on Ahmedabad and Vadodara, likewise started with textiles. Oil and gas finds around Ankleshwar, and refineries such as Koyali near Vadodara and the very large complex at Jamnagar, turned it into India's main petrochemical belt, served by ports like Kandla and Hazira.

The two eastern regions grew on jute and minerals. The Hugli belt stretches along both banks of the Hugli river north and south of Kolkata. Kolkata's port, the river for cheap transport and the jute of the Bengal delta gave it an early start; India's first jute mill came up at Rishra in 1855, and cotton, engineering and chemical works followed. Partition in 1947 cut the mills off from most jute fields, and the region's share of industry has since fallen, though Haldia downstream added a port and refinery. The Chota Nagpur region, across Jharkhand, northern Odisha and western West Bengal, rests on the country's richest store of coal and iron ore. It holds the steel plants at Jamshedpur, Bokaro, Durgapur and Rourkela, heavy engineering at Ranchi, and thermal and hydel power from the Damodar Valley Corporation.

Three regions lie in the south, and none of them sits on a big coalfield. The Bengaluru–Chennai region spread from early cotton mills around Coimbatore, which drew on cheap hydel power from the Pykara project in the Nilgiris, to public sector units in Bengaluru such as Hindustan Aeronautics, and then to vehicles and electronics around Chennai and information technology in Bengaluru. The Visakhapatnam–Guntur region on the Andhra coast has a shipyard, an oil refinery and the coastal steel plant at Visakhapatnam, with fertiliser and sugar units in the Krishna and Godavari deltas and gas from the Krishna–Godavari basin. The Kollam–Thiruvananthapuram region in southern Kerala is small and rests on farm and plantation products such as cashew, coir and rubber, with a refinery at Kochi. These southern cases show that power, ports, skills and policy can make up for a lack of coal.

The Gurugram–Delhi–Meerut region is the youngest of the eight and the furthest from minerals. It grew on the huge market and skilled workforce of the capital, with power brought in from distant thermal and hydel stations. Its industries are mostly light and high-value: cars and two-wheelers around Gurugram and Manesar, electronics, light engineering, software and services, many of them close to footloose industry. Around the major regions sit minor ones, such as Indore–Dewas–Ujjain, Durg–Raipur, Bilaspur–Korba and the Brahmaputra valley with its refineries and tea, and many single industrial districts. Even so, industry stays bunched in a few belts. Firms find roads, power, suppliers and trained labour ready in old centres, while backward areas lack them, so new investment keeps following the old pattern unless policy pushes it elsewhere. This is why each industrial region matters for regional inequality.

An industrial corridor is a planned belt of industry laid out along a major transport spine, usually a highway or freight railway joining big cities and ports. The idea is to give firms ready land, power, water and fast links to markets at many nodes along one line, instead of leaving them to crowd into old cities. India's first and largest is the Delhi–Mumbai Industrial Corridor (DMIC), developed with Japanese support. It runs alongside the Western dedicated freight corridor between Dadri near Delhi and the Jawaharlal Nehru Port near Mumbai, so that goods made along it can reach the western ports quickly. New greenfield industrial cities have been planned at nodes such as Dholera in Gujarat and Shendra–Bidkin near Aurangabad in Maharashtra, with plots, roads and utilities built before factories arrive.

Other corridors followed on the same model. The Amritsar–Kolkata Industrial Corridor is planned along the Eastern dedicated freight line across the densely peopled northern plains. The Chennai–Bengaluru Industrial Corridor links two southern metros and their ports, again with Japanese help. The East Coast Economic Corridor, supported by the Asian Development Bank, began with a Visakhapatnam–Chennai stretch, and a Bengaluru–Mumbai Economic Corridor runs through the Deccan interior. To run these together, the company first set up for the DMIC was renamed the National Industrial Corridor Development Corporation (NICDC) in 2016, and it now oversees eleven corridors. In August 2024 the Union Cabinet approved twelve more industrial smart cities under the programme. The aim of every industrial corridor is to spread manufacturing into new places with planned 'plug-and-play' land, instead of leaving it to pile up in the old regions.

Zones and parks are smaller tools that also bend the location map. India opened Asia's first export processing zone at Kandla in Gujarat in 1965, an enclosed area where factories making goods for export could import inputs without duty. Later zones followed at places like Santacruz in Mumbai and Falta near Kolkata. Under the Special Economic Zones Act, 2005, a special economic zone is treated as outside India's customs territory for trade purposes, and firms in it get simpler rules and tax benefits; the rules of the Act are taught in the economy chapter. For geography the point is that such zones, along with industrial parks, food parks and textile parks, pull investment to sites chosen by policy, often near ports and highways. Clusters of small firms making the same product, such as knitwear at Tiruppur or ceramics at Morbi, show how specialised districts grow when many firms share skills and suppliers.

Industrial growth has also brought pollution of air, water and land. Smoke and gases from thermal plants, steel works, cement kilns and refineries foul the air; tanneries, chemical units and sugar mills have discharged waste into rivers such as the Ganga near Kanpur. The worst industrial accident in India took place at Bhopal on the night of 2–3 December 1984, when methyl isocyanate gas leaked from the Union Carbide pesticide plant, killing thousands. The shock helped bring in the Environment (Protection) Act, 1986. Pollution control boards now sort industries into Red, Orange, Green and White categories by how much they pollute, a scheme revised in 2016; Red units face the strictest controls and White units need no consent to operate. Courts too have stepped in: in M.C. Mehta v. Union of India (1996), the Taj Trapezium case, the Supreme Court ordered coal-using industries near the Taj Mahal to switch to natural gas or move away.

Put together, the map of Indian industry has two layers. The older layer is the set of regions that grew from a natural or historical advantage: cotton and ports in the west, jute and the river in the Hugli belt, coal and iron in Chota Nagpur, hydel power and skills in the south, and the capital's market in the north. The newer layer is drawn by policy: corridors laid along freight railways and highways, smart industrial cities, zones and parks meant to carry factories into new places. Both layers depend on transport, which is why Parts 3 and 4 turn to roads, railways, ports, waterways, airways and pipelines. And both carry an environmental cost that planning now tries to control. When reading any question on an industrial region or an industrial corridor, ask first what drew industry there and what links it to its markets.

Exam traps

• Chota Nagpur is the region built on COAL and IRON ORE; the Hugli belt grew on JUTE, the river and Kolkata port. Do not swap their bases.
• The Gurugram–Delhi–Meerut region is far from minerals; it grew on the MARKET and skilled labour of the capital, and its industries are light.
• None of the three southern regions rests on a big coalfield; hydel power (Pykara), ports, skills and policy made up for it.
• Kandla (1965) was Asia's FIRST export processing zone; the SEZ Act came much later, in 2005.
• The DMIC runs along the WESTERN dedicated freight corridor (Dadri–JNPT); the Amritsar–Kolkata corridor runs along the EASTERN one.
• The DMIC Development Corporation was renamed NICDC in 2016; NICDC now oversees all the corridors, not only the DMIC.
• The Bhopal gas leak (2–3 December 1984) was methyl isocyanate from a PESTICIDE plant; the Environment (Protection) Act followed in 1986.
• In the 2016 categories, RED units pollute most; WHITE units are practically non-polluting and need no consent to operate.

Recap

• An industrial region is a belt of interdependent factories, workers and services; eight major regions are usually named.
• West: Mumbai–Pune (cotton, port, hydel, Mumbai High) and Gujarat (cotton, then oil, Koyali and Jamnagar).
• East: Hugli belt (jute, river, Kolkata port; first jute mill Rishra 1855) and Chota Nagpur (coal, iron ore, steel plants, DVC).
• South: Bengaluru–Chennai, Visakhapatnam–Guntur and Kollam–Thiruvananthapuram, none on a big coalfield.
• North: Gurugram–Delhi–Meerut grew on the capital's market; minor regions include Indore–Dewas–Ujjain, Durg–Raipur and Bilaspur–Korba.
• Corridors: DMIC along the Western DFC (Dholera, Shendra–Bidkin), Amritsar–Kolkata, Chennai–Bengaluru, East Coast, Bengaluru–Mumbai; NICDC (renamed 2016), eleven corridors.
• Kandla (1965) was Asia's first EPZ; SEZ Act 2005; parks and clusters such as Tiruppur and Morbi pull industry to chosen sites.
• Pollution: Bhopal (1984) and the 1986 Act; Red–Orange–Green–White categories (2016); Taj Trapezium case (1996).

Practice questions

Sources

• Department for Promotion of Industry and Internal Trade: industry profiles and state industrial data; Annual Survey of Industries (Ministry of Statistics and Programme Implementation) — https://dpiit.gov.in
• Ministry of Textiles: history of the cotton and jute mill industries, jute sector profile — https://texmin.nic.in
• Ministry of Steel and Steel Authority of India Limited: plant profiles (Bhilai, Durgapur, Rourkela, Bokaro); Damodar Valley Corporation profile — https://steel.gov.in
• National Industrial Corridor Development Corporation: industrial corridor programme, nodes and smart industrial cities; PIB release on Cabinet approval of 12 industrial smart cities (August 2024) — https://www.nicdc.in
• Dedicated Freight Corridor Corporation of India: Eastern and Western dedicated freight corridors — https://dfccil.com
• Special Economic Zones Act, 2005; Department of Commerce SEZ portal, history of export processing zones from Kandla (1965) — https://sezindia.nic.in
• Central Pollution Control Board and Ministry of Environment, Forest and Climate Change: re-categorisation of industries into Red, Orange, Green and White (2016); Environment (Protection) Act, 1986 — https://cpcb.nic.in
• Supreme Court of India: M.C. Mehta v. Union of India (Taj Trapezium case), 1996 — https://main.sci.gov.in