The Biosphere Reserves of India Explained

The biosphere reserves of India are some of the country’s largest and most ambitious conservation landscapes, stretching from the cold deserts of Spiti to the mangrove deltas of the Sundarbans and the rainforests of the Great Nicobar Island. Unlike a strictly fenced park, a biosphere reserve is designed to protect wildlife and ecosystems while allowing people who live in and around them to carry on sustainable livelihoods.

The idea comes from UNESCO’s Man and the Biosphere (MAB) Programme, and India has embraced it since the mid-1980s. This guide explains what these reserves are, how the three-zone model works, how they differ from national parks and sanctuaries, which ones exist, and what threatens them. Content was last reviewed on 1 October 2026.

What Is a Biosphere Reserve?

A biosphere reserve is a large area of terrestrial, coastal or marine ecosystem that is recognised for both its natural value and its human story. The word “biosphere” refers to the thin layer of Earth where life exists, and the concept asks a simple question: can we conserve nature without pushing people out of the picture?

Traditional conservation in the twentieth century often relied on exclusion. Land was marked off, villages were sometimes relocated, and access was restricted. Biosphere reserves took a different path. They treat the landscape as a living laboratory where conservation, scientific research and local development are meant to reinforce one another.

Three functions of every reserve

• Conservation: protecting genetic resources, species, ecosystems and landscapes.
• Development: promoting economic and social growth that is culturally appropriate and ecologically sound.
• Logistic support: backing research, monitoring, education and training related to local, national and global conservation issues.

Because of this balance, biosphere reserves are often described as “learning places for sustainable development”. Many include forests, grasslands, wetlands, coral reefs, farmland and villages within a single boundary.

The UNESCO Man and the Biosphere Programme

The Man and the Biosphere Programme was launched by UNESCO in the early 1970s as an intergovernmental scientific programme. Its aim was to build a scientific basis for improving the relationship between people and their environments. Out of this effort grew the World Network of Biosphere Reserves, which today includes several hundred sites across well over a hundred countries.

The programme has been guided by strategic documents over the decades. The Seville Strategy of 1995 and the Statutory Framework of the World Network set out the criteria a site must meet, including the three-zone structure, an appropriate governance arrangement and a commitment to research and monitoring. Later action plans pushed reserves to engage more with climate change, urbanisation and local participation.

How a site joins the network

A country first designates an area nationally and then submits a nomination to UNESCO. The nomination is examined by the MAB International Co-ordinating Council, which decides whether the site meets the criteria. Once accepted, the site becomes part of the World Network but remains under the sovereign jurisdiction of the country concerned. Each site is also expected to undergo a periodic review roughly every ten years to show it still meets the standards.

It is worth remembering that a UNESCO biosphere label does not create new national laws. It is an international recognition that encourages good management and cooperation, and it is different from a World Heritage Site tag, though some Indian sites, such as the Sundarbans and Nanda Devi, carry both kinds of recognition in some form.

The Three-Zone Model Explained

The signature feature of a biosphere reserve is its zoning. Imagine concentric rings: the most strictly protected area sits at the centre, wrapped by a supporting buffer, and then a wider belt where ordinary human life and development take place.

Core zone

The core zone is the heart of the reserve. It is a legally protected area, commonly a national park or wildlife sanctuary, where natural ecosystems are kept with minimal disturbance. Activities here are generally limited to non-destructive research and monitoring. This is where sensitive species, undisturbed forests and fragile habitats are secured.

Buffer zone

The buffer zone surrounds or adjoins the core. Activities here are compatible with conservation objectives, such as environmental education, ecotourism, recreation, applied and basic research, and limited, regulated use of resources. It acts as a cushion, reducing the pressure of outside activity on the core.

Transition zone

The transition zone is the outermost area. Here the emphasis falls on sustainable resource use and community development. Farms, villages, plantations, small industries and settlements are all found here. Local communities, scientists, managers and other stakeholders work together to plan and carry out activities in a way that supports the whole reserve. The boundaries of this zone are often flexible and are not always fixed by law.

• Core: strict protection, minimal disturbance.
• Buffer: research, education and limited, regulated activity.
• Transition: sustainable use, settlements and community livelihoods.

How Biosphere Reserves Differ from National Parks and Sanctuaries

People often confuse biosphere reserves with national parks, tiger reserves or wildlife sanctuaries. The easiest way to remember the difference is that national parks and sanctuaries are legal categories under the Wildlife (Protection) Act, 1972, while a biosphere reserve is a broader designation that wraps around such areas.

Layered, not competing

These categories are not rivals. The core zone of a biosphere reserve is often itself a national park or sanctuary. In the Nilgiris, for instance, protected areas such as Mudumalai, Bandipur, Nagarhole and Silent Valley sit inside a larger biosphere landscape. In this sense the biosphere reserve is a framework that adds a layer of landscape-level planning, community participation and research over existing protected areas.

India’s Biosphere Reserve Programme

India joined the MAB effort early. The Ministry of Environment, Forest and Climate Change (MoEFCC) leads the national programme, advised by a national MAB committee of scientists and officials. The Government designates an area as a biosphere reserve after assessing its ecological importance, representativeness and potential for conservation and sustainable development.

The first Indian reserve, the Nilgiri Biosphere Reserve, was designated in 1986. Over the following decades more were added across very different habitats, and the country now has 18 biosphere reserves. Roughly a dozen of them have been accepted into UNESCO’s World Network of Biosphere Reserves, while the rest remain national designations.

Funding and management

The Centre supports the programme through a scheme for the development of biosphere reserves, with State Governments sharing responsibility because forests and land are largely a state subject on the ground. Each reserve has a management authority or committee, usually led by state forest or wildlife officials, with scientific institutions and sometimes local representatives involved. Research partners include universities and national institutes such as the Wildlife Institute of India and the Botanical and Zoological Surveys of India.

The 18 Biosphere Reserves of India at a Glance

The table below lists all eighteen reserves with the state or region where each lies and a signature feature. Boundaries span more than one state in several cases, so the state shown is the principal location.

Highlights: Notable Biosphere Reserves

Nilgiri Biosphere Reserve

Spread across the junction of Tamil Nadu, Kerala and Karnataka, the Nilgiri reserve is the pioneer of the programme. It protects a mosaic of montane shola forests, grasslands and tropical forests, and shelters the Nilgiri tahr, the lion-tailed macaque and a wide range of orchids and amphibians. Indigenous groups such as the Todas, Kotas, Irulas and Kurumbas have shaped this landscape for generations.

Nanda Devi and Khangchendzonga

These two Himalayan reserves protect some of the most dramatic mountain scenery in the country. Nanda Devi in Uttarakhand is associated with a famously restricted core around the peak of the same name, long kept free of heavy human use. Khangchendzonga in Sikkim guards glaciers, alpine meadows and forests, and is also recognised internationally for its mix of natural and cultural importance.

Sundarbans and Gulf of Mannar

The Sundarbans, shared with Bangladesh across the Ganga-Brahmaputra delta, is a tidal mangrove forest where the Royal Bengal tiger swims between islands. The Gulf of Mannar, off the Tamil Nadu coast, is among the richest marine regions in South Asia, with coral reefs, seagrass meadows and the gentle dugong. Together they show that biosphere reserves are not only about forests.

Great Nicobar, Simlipal and Kachchh

Great Nicobar protects equatorial-style rainforest and the traditional homelands of the Shompen and Nicobarese. Simlipal in Odisha is known for its sal forests, elephants and tigers, along with a rare melanistic or “pseudo-melanistic” tiger form. Kachchh in Gujarat covers the Rann salt marshes, a very different habitat from the rest, home to the Indian wild ass and enormous flocks of migratory birds.

Central and eastern examples

Pachmarhi and Panna in Madhya Pradesh, and Achanakmar-Amarkantak straddling Madhya Pradesh and Chhattisgarh, preserve the central Indian forests and river sources. Manas, Dibru-Saikhowa, Dehang-Debang and Nokrek represent the biologically rich north-east, while Seshachalam in the Eastern Ghats is known for the red sanders tree, and the Cold Desert reserve covers the stark, high-altitude trans-Himalayan region of Spiti and Lahaul.

Biosphere Reserves and India’s Biodiversity Hotspots

India is one of the world’s megadiverse countries, and it contains parts of several globally recognised biodiversity hotspots, regions with exceptional numbers of endemic species that are also under significant threat. Many biosphere reserves sit squarely inside them.

• The Himalaya: Nanda Devi, Khangchendzonga, Cold Desert, and parts of the eastern Himalayan landscape such as Dehang-Debang protect alpine and temperate ecosystems.
• The Western Ghats and Sri Lanka: Nilgiri and Agasthyamalai conserve one of the oldest and wettest mountain chains, packed with endemic plants, frogs and mammals.
• Indo-Burma: reserves in the north-east, including Dibru-Saikhowa and Nokrek, lie in or near this hotspot, which is rich in primates, birds and plants.
• Sundaland: the Nicobar Islands, including the Great Nicobar reserve, belong to this South-East Asian hotspot.

This overlap explains why biosphere reserves matter so much for national biodiversity strategy. By covering a diverse set of biogeographic zones, from cold desert to coral reef, the network acts as a representative sample of India’s natural heritage.

Why Biosphere Reserves Matter

Biodiversity and endemic species

Reserves protect not just charismatic animals like tigers but also countless plants, insects, fungi and microorganisms. They conserve endemic species found nowhere else, and they safeguard the wild relatives of crops and medicinal plants, which are valuable for food security and health.

Climate regulation and ecosystem services

Forests, mangroves and wetlands store carbon, regulate local rainfall, protect watersheds and buffer coasts against storms. The Sundarbans mangroves, for example, act as a natural shield for millions of people living along the delta, while mountain reserves feed the river systems that support the plains downstream.

Research and monitoring

Because they are large, long-lasting and relatively well documented, biosphere reserves serve as outdoor laboratories. Scientists track climate change impacts, species migrations and the effects of land use, and the findings feed back into policy.

Cultural and indigenous value

Many reserves are also cultural landscapes. Traditional knowledge about herbs, seeds, fishing, farming and forest management is preserved alongside the ecosystems themselves.

People at the Centre: Communities and Livelihoods

What makes the biosphere reserve concept distinct is that people are not treated as outsiders. Tribal and rural communities live in or near most Indian reserves, and their relationship with forests, rivers and the sea is long and deep.

In the Nilgiris, groups such as the Todas and Kotas maintain unique cultural traditions. In Agasthyamalai, the Kani community is widely known for its knowledge of medicinal plants. In Great Nicobar, the Shompen live largely by traditional hunting and gathering, which calls for special care and protection of their autonomy. In the Sundarbans, honey collectors and fishers depend on mangrove resources.

Sustainable livelihood approaches include:

• Community-managed ecotourism and homestays.
• Sustainable harvesting of non-timber forest products such as honey, bamboo and medicinal plants.
• Organic farming, agroforestry and traditional crop varieties.
• Handicrafts and local value-added products.
• Joint forest management and participation in monitoring.

When local people see direct benefits from conservation, they become its strongest allies. When they do not, conflict can follow, which is why participation is a central principle and not an afterthought.

Challenges Facing Biosphere Reserves

Despite their promise, biosphere reserves in India face a number of serious pressures. Many of these are common to protected areas worldwide, but the large, populated nature of biosphere reserves makes them especially complex to manage.

Key challenges

• Habitat loss and fragmentation: roads, mining, dams, plantations and expanding settlements cut up natural habitats.
• Human-wildlife conflict: crop raiding by elephants, livestock losses to big cats and conflicts in fishing and farming areas strain relationships between people and wildlife.
• Climate change: rising sea levels threaten the Sundarbans and Gulf of Mannar, warming affects glaciers and alpine zones, and shifting rainfall alters forests.
• Invasive species: exotic weeds and animals can crowd out native species.
• Unsustainable resource use: overfishing, illegal logging, poaching and over-grazing.
• Tourism pressure: unplanned tourism can bring pollution and disturbance.
• Weak legal status: because the label is a designation, the buffer and transition zones often lack strong dedicated legal protection, making enforcement dependent on other laws.
• Funding and coordination gaps: many agencies share responsibility, and resources can be thin.

The way forward

Experts generally point towards better zoning, stronger participation of communities, regular scientific monitoring, climate-resilient planning and a clearer legal framework. Integrating reserves with wider landscape corridors, so that animals can move between protected areas, is also seen as vital.

Conclusion

The biosphere reserves of India show that conservation and human well-being need not be at odds. By layering core, buffer and transition zones across large landscapes, the programme tries to protect the country’s richest ecosystems while giving the people who live there a stake in their future. From the Nilgiris in 1986 to the cold deserts and eastern rainforests added since, the network now covers an impressive range of habitats. Its long-term success depends on research, fair governance and the continued partnership of local communities.

Frequently Asked Questions

What is a biosphere reserve?

A biosphere reserve is a large protected landscape that aims to conserve biodiversity while also supporting sustainable use and development by local people. It follows the UNESCO Man and the Biosphere framework and is divided into core, buffer and transition zones. It also supports research and education.

How many biosphere reserves are there in India?

India has 18 biosphere reserves designated by the Government of India. Roughly a dozen of them are also included in UNESCO’s World Network of Biosphere Reserves, while the others are recognised at the national level.

Which was the first biosphere reserve in India?

The Nilgiri Biosphere Reserve, spread across Tamil Nadu, Kerala and Karnataka, was the first, designated in 1986. It is known for its Western Ghats biodiversity, including the Nilgiri tahr and the lion-tailed macaque.

What is the difference between a biosphere reserve and a national park?

A national park is a legally defined protected area where human activity is strongly restricted, under the Wildlife (Protection) Act, 1972. A biosphere reserve is a larger designation that often includes a national park as its core, but also has buffer and transition zones where people live and work sustainably.

What are the three zones of a biosphere reserve?

The core zone is strictly protected with minimal disturbance. The buffer zone allows research, education and limited, compatible activities. The transition zone is the outer area where communities carry out sustainable farming, settlement and other development.

Which Indian biosphere reserves are in biodiversity hotspots?

Several are. Nanda Devi, Khangchendzonga and Cold Desert lie in the Himalaya, while Nilgiri and Agasthyamalai are in the Western Ghats. North-eastern reserves such as Dibru-Saikhowa and Nokrek relate to the Indo-Burma region, and Great Nicobar belongs to the Sundaland hotspot.

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