Kidneys of the Landscape: Wetlands and Ramsar Sites

A wetland is an area where water is the primary factor controlling the environment and the life it supports: land that is wet most or all of the time, long enough for plants, animals and microbes to evolve for wet conditions. Wetlands cover only about 6 percent of the Earth's land surface, yet 40 percent of all plant and animal species live or breed in them. For UPSC, wetlands link biodiversity, water security, climate action and international law in a single landscape, which is why the Ramsar Convention and its doctrine of wise use appear again and again in both prelims and mains.

What counts as a wetland

The Ramsar Convention defines wetlands broadly: marshes, fens, peatlands and other areas of water, whether natural or artificial, permanent or temporary, static or flowing, fresh, brackish or salt. They fall into three families. Inland wetlands include lakes, rivers, floodplains, marshes and peatlands. Coastal wetlands include mangroves, salt marshes, estuaries, lagoons and coral reefs. Human-made wetlands include farm ponds, reservoirs, tanks and salt pans. India, with its monsoon-fed tanks, Himalayan lakes, Gangetic floodplains and long coastline, holds examples of nearly every type.

Why wetlands matter: the kidney metaphor

Wetlands are often called the kidneys of the landscape because they filter pollutants, trap sediments and recharge groundwater, much as kidneys clean blood. Their services group into four kinds. Provisioning services supply fish, fresh water, timber, fuelwood and medicines. Regulating services include flood control, drought buffering, carbon storage and shoreline protection. Cultural services cover recreation, tourism and spiritual values. Supporting services such as nutrient cycling and nursery habitats for fish and birds underpin all the rest.

Two numbers capture their disproportionate value. Wetlands act as breeding, nesting and nursery grounds that keep fisheries and bird populations alive: Keoladeo National Park in Rajasthan, a UNESCO World Heritage site and Ramsar site, is a critical wintering ground on the Central Asian Flyway, while Loktak Lake in Manipur hosts the world's only floating national park, Keibul Lamjao, home to the endangered sangai deer. As ecological refugia, wetlands buffer species against droughts, floods and heat stress, which makes them frontline climate infrastructure, not just pretty scenery.

The Ramsar Convention and the doctrine of wise use

The Ramsar Convention, adopted in 1971 in the Iranian city of Ramsar, is the first modern global treaty devoted to a single ecosystem. Its mission is the conservation and wise use of all wetlands through local and national action plus international cooperation. A wetland becomes a Ramsar site, a wetland of international importance, when it meets at least one of nine criteria covering representative, rare or unique wetland types and their support to vulnerable species and ecological communities.

"Wise use" is the Convention's guiding idea, and UPSC asked about it directly in the 2018 mains paper (GS-III). It means maintaining the ecological character of a wetland, its natural structure and functions, while allowing human use that is ecologically sustainable. In practice this looks like regulated water withdrawals for agriculture, sustainable fishing quotas, and ecotourism that funds protection instead of degrading it. It was one of the earliest formal applications of sustainable development thinking: conservation and livelihoods managed together through integrated plans, not fenced off from each other.

Sites whose ecological character is deteriorating go on the Montreux Record, the Convention's register of priority concern. Two Indian sites carry this tag: Keoladeo National Park and Loktak Lake, both flagged for water-management and encroachment pressures. Listing is not a punishment; it is a call for restoration support.

A site qualifies by meeting at least one of the nine Ramsar criteria. The first is about the wetland itself; the rest are about the life it supports:

Prelims loves Criteria 5, 6 and 9 because they are numerical. The six is also the trap: Criterion 6 counts 1 percent of a population, not of a species' global range map, which is why small wetlands hosting rare, concentrated populations can qualify.

India's Ramsar network: from 26 to 101

India acceded to the Convention in 1982, and its first two Ramsar sites, Chilika Lake in Odisha and Keoladeo National Park in Rajasthan, were designated in 1981. The network then grew slowly for three decades before accelerating: from just 26 sites in 2014 to 101 sites by August 2026, the largest national network in Asia and the third largest in the world. The 101st site, Glaw Lake in Arunachal Pradesh's Kamlang Tiger Reserve, designated in August 2026, was the state's first and extended Ramsar recognition to the Eastern Himalayas.

The geography of the network tells its own story. Tamil Nadu leads with 20 sites, while West Bengal protects the largest total area, anchored by the Sundarban Wetland, India's single largest Ramsar site at about 423,000 hectares. Recent additions show the network diversifying: Chhari-Dhand in Gujarat's Kachchh, a seasonal saline wetland sheltering the critically endangered sociable lapwing, and Patna Bird Sanctuary in Uttar Pradesh, a mosaic of marshes, woodlands and grasslands holding 178 bird species.

Read as a timeline, the network's growth is one of the steepest among all contracting parties:

Tamil Nadu leads the states with 20 sites, followed by Uttar Pradesh with 11, a distribution that reflects both wetland wealth and how actively a state government prepares nominations. Designation, examiners keep reminding candidates, is the easy half: it carries no dedicated funding stream of its own, which is why the conservation architecture below matters.

Special cases: peatlands and urban wetlands

Peatlands are waterlogged wetlands where incomplete plant decomposition builds up carbon-rich peat over millennia. Though they cover a small fraction of land, the world's peatlands store roughly 600 billion tonnes of carbon, making them among the densest carbon sinks on Earth. Drained or burned peatlands flip from sink to source, releasing that stored carbon. India holds Himalayan peatlands such as Tso Kar, Hanle and Chushul marshes in Ladakh, and Chandratal in Himachal Pradesh, fragile systems threatened by grazing pressure and climate warming.

Urban wetlands are wetlands inside or around cities, and they are disappearing the fastest. Bengaluru's lakes once managed the city's stormwater; their encroachment, typified by the shrinkage of Bellandur and Varthur lakes, turned a flood-management asset into a frothing, fire-prone liability. The East Kolkata Wetlands, a Ramsar site, show the opposite model: a working wetland that treats the city's sewage through natural processes while supporting fisheries and paddy. The contrast is a ready-made mains example of wise use versus neglect.

What is destroying wetlands

The threats are consistent across India. Encroachment and land-use conversion eat into lake beds and floodplains for housing and industry. Pollution from untreated sewage, industrial effluents and agricultural runoff chokes water bodies with nutrients, triggering algal blooms. Invasive species like water hyacinth smother open water. Over-extraction of groundwater lowers water tables that feed wetlands, and climate change alters rainfall timing and glacial melt that Himalayan wetlands depend on. Small, seasonal and unprotected wetlands are vanishing fastest, often without any record that they existed.

India's conservation architecture

India's wetland policy has evolved from projects to law. The National Wetlands Conservation Programme began in 1985-86 as a centrally sponsored scheme preparing Management Action Plans for individual wetlands. It was later merged with the National Lake Conservation Plan into the National Plan for Conservation of Aquatic Ecosystems (NPCA), which funds restoration, pollution control and scientific monitoring of wetlands and lakes together.

The legal backbone is the Wetlands (Conservation and Management) Rules, 2017, which empower states and Union Territories to identify and notify wetlands, require each State Wetland Authority to apply the wise-use principle, and create a National Wetlands Committee for policy guidance and monitoring. Newer missions add energy: Amrit Dharohar, launched in 2023, promotes community-led conservation, ecotourism and green jobs at Ramsar sites over three years, while the National Wetland Inventory and Assessment by ISRO's Space Applications Centre has mapped over two lakh wetlands across about 16 million hectares, giving planners a baseline that never existed before.

Ramsar COP15 at Victoria Falls: India's lifestyle resolution

The 15th Conference of the Parties met at Victoria Falls, Zimbabwe, in July 2025 under the theme Protecting Wetlands for Our Common Future. Its headline product, the Victoria Falls Declaration, committed parties to restore degraded freshwater ecosystems, protect migratory birds and adopt clearer criteria for designating new sites, alongside a new strategic plan with four goals and 18 targets.

India's contribution was a first in the Convention's history: a resolution on Promoting Sustainable Lifestyles for the Wise Use of Wetlands, adopted at the plenary on 30 July 2025 with support across the Convention's 172 parties. It carries Mission LiFE into wetland governance, arguing that individual and societal choices on water use, waste and consumption are themselves conservation variables, and it urges parties to build lifestyle-based interventions into wetland management plans and investments.

The resolution matters for two reasons. Diplomatically, it is lifestyle diplomacy: India exporting a behavioural idea rather than only seeking finance. Domestically, it hands the wise-use doctrine a public face, because a wetland's worst enemies, encroachment, dumping and over-extraction, are behaviours long before they are engineering problems.

The way forward

Wetlands survive when people benefit from their survival. That means enforcing the 2017 Rules against encroachment instead of regularising it, giving State Wetland Authorities real staff and budgets, scaling the East Kolkata model of productive sewage-fed wetlands, and protecting urban lakes as flood infrastructure with the same seriousness as dams. The jump from 26 to 101 Ramsar sites shows political will exists; the next leap is making every one of those designations mean something on the ground. The Supreme Court's August 2025 direction that states account for protecting the over 5.5 lakh sub-2.25-hectare wetlands mapped by ISRO extends that discipline to the small, seasonal water bodies vanishing fastest.

A final layer is climate adaptation. Nagapattinam's sea-wall construction is the textbook example of building engineered buffers so coastal wetlands survive rising seas and fiercer cyclones, and constructed wetlands, such as the ones purifying sewage at Delhi's Asola Bhatti Wildlife Sanctuary, show restoration doubling as infrastructure: nature rebuilt to do a city's work.

Key Terms

• A wetland: Under the Ramsar Convention, areas of marsh, fen, peatland or water, whether natural or artificial, permanent or temporary, with water that is static or flowing, fresh, brackish or salt, including areas of marine water whose depth at low tide does not exceed six metres. In India, wetlands are regulated by the Wetlands (Conservation and Management) Rules, 2017. Example: Chilika Lake in Odisha, India's largest brackish-water lagoon, is a Ramsar site. Example: Chilika Lake in Odisha, India's largest brackish-water lagoon and a Ramsar site.
• Ramsar Convention: The Ramsar Convention is the 1971 international treaty, adopted at Ramsar in Iran, that provides a global framework for the conservation and wise use of wetlands, especially as waterfowl habitat. Parties designate wetlands of international importance as Ramsar Sites and commit to maintaining their ecological character. India has 101 Ramsar Sites (as of August 2026). For UPSC prelims it is the classic environment treaty alongside CITES and the Bonn Convention. Example: Chilika Lake in Odisha, designated a Ramsar Site
• wise use: "Wise use" is the central guiding principle of the Ramsar Convention on wetlands, defined as maintaining the ecological character of a wetland through the implementation of ecosystem approaches within the context of sustainable development. It obliges contracting parties to plan land use so that wetlands are conserved while compatible human uses, such as regulated fishing and ecotourism, continue. Every Ramsar site management plan in India is expected to operationalise this principle. Example: India's management plans for Ramsar sites operationalise wise use by permitting regulated community fishing at Chilika Lake alongside habitat conservation for migratory birds.
• Inland wetlands: Wetlands located away from the coast, such as marshes, swamps, lakes, rivers, floodplains, tanks and reservoirs, which regulate water flow, recharge groundwater, trap sediments and support rich biodiversity. Under the Ramsar Convention's classification, inland wetlands form a major category alongside marine or coastal wetlands and human-made wetlands. Example: Keoladeo National Park in Rajasthan is a famous inland wetland and Ramsar site, renowned for migratory waterbirds.
• Coastal wetlands: Coastal wetlands are waterlogged ecosystems at the land-sea interface, including estuaries, lagoons, mangroves, tidal flats, salt marshes and brackish-water lakes. They function as nurseries for marine fisheries, storm-surge buffers, carbon sinks and habitats for migratory birds. They are protected under the Ramsar Convention, the Coastal Regulation Zone regime and national wetland rules, and are among the ecosystems most threatened by reclamation, pollution and sea-level rise. Example: Chilika Lake in Odisha, Asia's largest brackish-water lagoon and a Ramsar site since 1981, supports lakhs of migratory birds and a major fishery.
• Human-made wetlands: Human-made wetlands are wetlands created or heavily modified by people, including reservoirs, village tanks, paddy fields, salt pans, wastewater treatment ponds and urban lakes. Despite their artificial origin, many provide vital ecosystem services such as groundwater recharge, flood moderation, fisheries and habitat for migratory birds, and several are designated Ramsar sites. Their management must balance human use with ecological health. Example: The East Kolkata Wetlands, a Ramsar site, naturally treat the city's sewage through a traditional system of fish ponds and paddy fields.
• kidneys of the landscape: Wetlands are often called the kidneys of the landscape because, like kidneys in the human body, they filter and purify water. As water flows through marshes, bogs and floodplains, sediments settle out and plants and microbes absorb excess nutrients and trap pollutants, improving water quality downstream. They also regulate floods, recharge groundwater and support rich biodiversity. Example: The wetlands around Loktak Lake in Manipur or the urban wetlands of cities like Bengaluru trap silt and pollutants before they reach rivers and lakes, performing the kidney-like filtering service that makes them vital to water security.
• Provisioning services: Provisioning services are one of the four categories of ecosystem services in the Millennium Ecosystem Assessment framework, covering the material products that humans obtain directly from ecosystems. They include food, fresh water, timber, fuelwood, fiber, genetic resources, and medicinal plants. Their sustainable management is central to debates on food security, forest policy, and biodiversity conservation. Example: Marine fisheries supplying food and livelihoods, or forests providing timber and non-timber products like honey and medicinal herbs
• Regulating services: Regulating services are the benefits ecosystems provide by regulating natural processes, one of the four categories of ecosystem services recognised by the Millennium Ecosystem Assessment. They include climate regulation, flood control, water purification, pollination, pest control and disease regulation. Unlike provisioning services such as timber or fish, they are often invisible and therefore undervalued in policy decisions. Example: Mangroves regulate coastal flooding by absorbing storm surges, and wetlands purify water by filtering pollutants.
• Cultural services: Cultural services are the non-material benefits that people obtain from ecosystems, one of the four categories of ecosystem services recognised by the Millennium Ecosystem Assessment (2005) alongside provisioning, regulating and supporting services. They include recreation and ecotourism, spiritual and religious values, aesthetic appreciation, cultural heritage and opportunities for education and research. Because they are intangible, cultural services are the hardest ecosystem benefits to value in money terms, yet they often motivate conservation most strongly. Example: The spiritual value attached to the Ganga and the ecotourism economy around Kaziranga National Park are cultural services provided by those ecosystems.
• Supporting services: Supporting services are one of the four ecosystem service categories of the Millennium Ecosystem Assessment. They are the underlying ecological processes, such as nutrient cycling, primary production, soil formation and the water cycle, that make all other ecosystem services (provisioning, regulating and cultural) possible. Example: Photosynthesis and nutrient cycling are supporting services that sustain food production and clean water.
• Keoladeo National Park: Keoladeo National Park, near Bharatpur in Rajasthan, is one of India's finest bird sanctuaries and a UNESCO World Heritage Site, inscribed in 1982. Developed from a former royal duck-shooting reserve, its mosaic of wetlands, woodlands and grasslands hosts over 350 bird species, including large wintering flocks of migratory waterfowl from Central Asia. It was historically one of the very few wintering grounds of the critically endangered Siberian crane, whose visits have now nearly ceased. Example: Every winter, painted storks, pelicans and bar-headed geese crowd Keoladeo's shallow lakes, making it a classic UPSC example of a wetland of international importance under the Ramsar Convention.
• Central Asian Flyway: The Central Asian Flyway is one of the world's nine major migratory bird flyways, stretching from breeding grounds in northern Russia and Siberia across Central Asia to wintering grounds in India and the Indian Ocean islands. India lies at the heart of this flyway, hosting hundreds of migratory species each winter in its wetlands. India is developing a national plan for the flyway and has designated key sites along it as Ramsar wetlands. Example: The Siberian crane, a critically endangered species, historically migrated along this flyway to Keoladeo National Park in Rajasthan.
• Loktak Lake: The largest freshwater lake in Northeast India, located in Manipur, famous for its phumdis, floating masses of vegetation, soil and organic matter. It hosts Keibul Lamjao National Park, the world's only floating national park, home to the endangered sangai (Manipur brow-antlered deer). A designated Ramsar site, it was placed on the Montreux Record in 1993 because of ecological threats from the Loktak hydroelectric project and catchment degradation. Example: Conservation of the sangai, found only in Keibul Lamjao on Loktak Lake, is a flagship case of wetland-linked species protection in India.
• Keibul Lamjao: Keibul Lamjao National Park in Manipur is the world's only floating national park, located on the southern shore of Loktak Lake. It is formed of phumdis, thick floating mats of vegetation and organic matter that rise and sink with the lake's water level. It is the last natural home of the sangai, the endangered brow-antlered deer of Manipur, also called the dancing deer for the way it walks on the spongy floating ground. Example: The sangai, found nowhere else in the wild, survives only in Keibul Lamjao's roughly 40 square kilometres of phumdis, making the park the centrepiece of Manipur's conservation identity.
• ecological refugia: Ecological refugia are areas where species or populations survive during periods of adverse conditions, such as glaciations, prolonged droughts or episodes of habitat destruction, and from which they can later recolonise surrounding areas. They act as safe havens that preserve biodiversity through climatic or ecological crises. Identifying and protecting refugia is a key strategy in conservation planning under climate change. Example: Tropical forest refugia that sheltered rainforest species through the ice ages of the Pleistocene, allowing forests to expand again when the climate warmed.
• Ramsar site: A Ramsar site is a wetland designated under the Ramsar Convention of 1971 as being of international importance, especially as waterfowl habitat. The convention, signed at Ramsar in Iran, obliges member countries to conserve listed wetlands and use them wisely. India is a party to the convention and has designated dozens of sites across the country. Example: Chilika Lake in Odisha and Keoladeo National Park in Rajasthan were among India's first wetlands listed as Ramsar sites.
• ecological character: Ecological character is a Ramsar Convention concept meaning the combination of ecosystem components, processes and benefits or services that characterise a wetland at a given point in time. It serves as the baseline against which change, including adverse human-induced change, is detected and assessed. Sites where ecological character has changed, is changing or is likely to change are placed on the Montreux Record, the Ramsar list of wetlands needing priority conservation attention. Example: Keoladeo National Park and Loktak Lake were placed on the Montreux Record after documented changes in their ecological character.
• sustainable development: Sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs, the classic definition from the 1987 Brundtland Commission report. It rests on three pillars, economic growth, social equity, and environmental protection, balanced together rather than traded off. It became the guiding framework of the 1992 Rio Earth Summit and the 2030 Agenda for Sustainable Development. Example: The 17 Sustainable Development Goals adopted by the UN in 2015 translate sustainable development into 169 targets to be achieved by 2030.
• Montreux Record: The Montreux Record is a register maintained under the Ramsar Convention listing Ramsar wetland sites where changes in ecological character have occurred, are occurring, or are likely to occur because of human interference, pollution, or natural causes. It was established in 1990 at the Montreux Conference of the Parties as a tool to flag wetlands needing priority conservation attention. Listing is voluntary and meant to trigger remedial national and international action, not punishment. Example: Chilika Lake in Odisha was listed on the Record in 1993 and removed in 2002 after restoration work improved its ecological character.
• Chilika Lake: Chilika Lake is a brackish water lagoon on Odisha's east coast, the largest coastal lagoon in India and one of the largest in the world. Designated a Ramsar site in 1981, it was among India's first two wetlands of international importance and is a critical wintering ground for migratory birds on the Central Asian Flyway. It is famous for the Irrawaddy dolphin population in its outer channel near Satapada. Example: After being placed on the Montreux Record of threatened Ramsar sites in 1993, Chilika was restored through desiltation and the opening of a new mouth to the sea, and was removed from the record in 2002, a celebrated conservation success.
• Glaw Lake: Glaw Lake is a high-altitude lake in Arunachal Pradesh's Kamlang Tiger Reserve that was designated India's 101st Ramsar site in August 2026. It was the state's first Ramsar site, extending international wetland recognition to the Eastern Himalayas. Example: Glaw Lake's Ramsar designation in August 2026 made Arunachal Pradesh the newest Indian state on the Ramsar list.
• Tamil Nadu: Tamil Nadu leads India's Ramsar network with 20 sites, the most of any state. The geography of the network tells its own story: while Tamil Nadu leads in number, West Bengal protects the largest total area, anchored by the Sundarban Wetland.
• West Bengal: West Bengal protects the largest total Ramsar area of any Indian state, anchored by the Sundarban Wetland, India's single largest Ramsar site. In the national network Tamil Nadu leads by number with 20 sites.
• Sundarban Wetland: The Sundarban Wetland in South 24 Parganas, West Bengal, is India's largest Ramsar site, covering 4,23,000 hectares. Designated a Wetland of International Importance in January 2019, it lies in the Ganga-Brahmaputra delta and forms part of the world's largest mangrove ecosystem, sheltering the Royal Bengal tiger, fishing cats, Irrawaddy dolphins and rich fisheries. Example: It is the only mangrove forest in the world that hosts wild tigers.
• Chhari-Dhand: Chhari-Dhand is a seasonal freshwater wetland in the Kutch district of Gujarat, lying between the Banni grasslands and the salt flats of the Rann of Kutch. Declared Gujarat's first Conservation Reserve in 2008, it hosts over 200,000 birds in good monsoon years, including flamingos, cranes and the rare Grey Hypocolius, and lies on the Central Asian Flyway. It was designated a Ramsar site of international importance in 2026, becoming Gujarat's fifth Ramsar site. Example: More than 40,000 common cranes have been observed at a single location within Chhari-Dhand during winter.
• Patna Bird Sanctuary: Patna Bird Sanctuary is a protected wetland in the Jalesar subdivision of Etah district, Uttar Pradesh, and at about 1 sq km (108 hectares) it is the smallest bird sanctuary in the state. Declared a sanctuary in 1991, this shallow rain-fed lake of the Gangetic plains hosts over a hundred migratory and resident bird species in winter, and it was designated a Ramsar site in 2026. Example: Northern pintails, greylag geese and sarus cranes gather at Patna in peak winter, when the sanctuary can host tens of thousands of birds despite its tiny size.
• Peatlands: Peatlands are waterlogged ecosystems where dead plant material accumulates as peat because decomposition is too slow in oxygen-poor, acidic conditions. Though they cover only about 3 percent of the Earth's land surface, they store vast amounts of carbon, so draining or burning them releases greenhouse gases and destroys unique biodiversity. Example: Indonesia's drained peatlands have fuelled devastating peat fires that send transboundary haze across Southeast Asia, which is why their conservation is a climate priority.
• Tso Kar: Tso Kar is a high-altitude wetland complex in the Changthang region of Ladakh, pairing the hypersaline Tso Kar lake with the freshwater Startsapuk Tso to its south. Designated India's 42nd Ramsar site in November 2020, it is one of the most important breeding areas of the black-necked crane in India and a key staging site on the Central Asian Flyway. Its name means white lake, after the salt efflorescence on its margins. Example: The black-necked cranes that breed in the Tso Kar basin each summer, alongside bar-headed geese and ruddy shelduck.
• Hanle and Chushul marshes: The Hanle and Chushul marshes are high-altitude freshwater marshes in eastern Ladakh, lying in the cold-desert trans-Himalayan landscape. They are important breeding and staging habitats for migratory waterbirds, including the black-necked crane, Ladakh's state bird, and support unique cold-desert biodiversity. These fragile wetlands face pressures from livestock grazing, tourism and a changing climate that is altering water availability. Example: The black-necked crane breeds in these high-altitude Ladakh marshes during the short Himalayan summer.
• Chandratal: Chandratal, meaning 'moon lake', is a crescent-shaped high-altitude lake in the Lahaul and Spiti district of Himachal Pradesh at about 4,300 metres above sea level. It was designated a Ramsar wetland of international importance in 2005 and is surrounded by the Chandratal Wildlife Sanctuary. Despite its cold desert setting, it supports snow leopards, Himalayan ibex, migratory birds and summer alpine meadows. Example: Trekkers reach Chandratal via the Kunzum Pass, and its pristine night skies make it a popular stargazing destination.
• Urban wetlands: Urban wetlands are lakes, marshes, floodplains and tanks located within or on the fringes of cities that regulate floods, recharge groundwater, treat wastewater naturally and support biodiversity. Because they sit on valuable real estate, they face extreme pressure from encroachment, sewage inflow, solid waste dumping and reclamation for construction. Their loss directly increases urban flooding and water scarcity, making them a recurring theme in environment and disaster management answers. Example: The East Kolkata Wetlands, a Ramsar site, naturally treat a large share of the city's sewage through a traditional system of wastewater fed fisheries, demonstrating the economic value of an intact urban wetland.
• Bellandur: Bellandur is a large lake in south-eastern Bengaluru, Karnataka, that became nationally infamous in the mid-2010s when it repeatedly produced thick toxic foam and even caught fire. The foam and fires were caused by untreated sewage and industrial effluents discharged into the lake, making it a textbook example of the ecological collapse of urban water bodies. Its degradation is frequently cited in UPSC answers on urban water pollution and the failure of sewage treatment enforcement. Example: In 2015 and 2017, Bellandur Lake's frothing surface spilled onto nearby roads and the lake surface caught fire, forcing authorities to act on sewage treatment compliance in Bengaluru.
• East Kolkata Wetlands: The East Kolkata Wetlands are a 12,500-hectare wetland complex east of Kolkata, designated a Ramsar site of international importance on 19 August 2002 (site no. 1208). They host the world's largest wastewater-fed aquaculture system: Kolkata's sewage flows through a network of fish ponds (bheris) covering about 4,000 hectares, where sunlight-driven biological processes treat the water while producing fish and fertilising vegetable farms. The system yields roughly 10,500 tonnes of fish and about 150 tonnes of vegetables daily, supporting the livelihoods of around 50,000 people, and is cited as a global model of wise use of wetlands. Example: Nearly a billion litres of Kolkata's wastewater are treated naturally in the wetlands' fish ponds each day before reuse in farming.
• Pollution: Pollution is the introduction of harmful substances or energy, such as chemicals, particulates, noise or heat, into the environment at levels that damage ecosystems and human health. Major forms include air, water, soil, noise and light pollution, regulated in India under laws like the Water Act of 1974 and the Air Act of 1981. Example: Untreated sewage discharged into a river depletes its dissolved oxygen and kills aquatic life, a classic case of water pollution affecting wetlands.
• Invasive species: Non-native species that are introduced, deliberately or accidentally, into an ecosystem where they spread aggressively, outcompete native species and cause ecological, economic or health harm. Invasive alien species are recognised as one of the leading drivers of biodiversity loss worldwide. Example: Water hyacinth choking Indian lakes and Lantana camara invading Indian forests are invasive species that degrade native habitats.
• climate change: Climate change is the long-term shift in global temperatures and weather patterns, driven since the industrial era chiefly by greenhouse gas emissions from fossil fuels, deforestation and industry. Its features are rising temperatures, sea-level rise and extreme weather. It matters for UPSC because GS-3 covers mitigation and adaptation, India's Panchamrit pledges and climate finance debates, all anchored by IPCC assessments. Example: the Paris Agreement (2015)
• National Wetlands Conservation Programme: India's centrally sponsored scheme, launched in 1985-86, that gave states and union territories financial and technical assistance to conserve and manage identified priority wetlands, with the goals of preventing further degradation, preparing a national wetland inventory, and promoting wise use for local communities. It identified 115 wetlands across 24 states and two union territories, and was merged with the National Lake Conservation Plan in February 2013 to form the integrated National Plan for Conservation of Aquatic Ecosystems (NPCA). Example: The 115 priority wetlands identified for conservation funding under this programme before its 2013 merger into NPCA.
• Management Action Plans: Wetland-specific conservation plans prepared for individual wetlands under India's centrally sponsored wetland conservation programme. Each plan assesses the wetland's hydrology, biodiversity, threats and stakeholder uses, then prescribes time-bound actions such as catchment treatment, pollution control and livelihood measures. They are the operational instrument for managing Ramsar sites and other priority wetlands. Example: Ramsar sites like Chilika and Loktak have Management Action Plans guiding desiltation, weed control and community co-management.
• Wetlands (Conservation and Management) Rules, 2017: The Wetlands (Conservation and Management) Rules, 2017, notified under the Environment (Protection) Act, 1986, are India's current legal framework for protecting wetlands, replacing the 2010 rules. They decentralised regulation by requiring each state to set up a State Wetland Authority to identify, notify and manage wetlands, and they prohibit activities such as encroachment, untreated waste discharge and construction of permanent structures within notified wetlands. The rules apply to wetlands notified by states, and Ramsar sites receive priority attention. Example: Under these Rules, a State Wetland Authority must prepare a list of wetlands in the state and recommend the ecologically sensitive ones for notification and protection.
• State Wetland Authority: The State Wetland Authority is the statutory body set up in each state and union territory under the Wetlands (Conservation and Management) Rules 2017. It identifies, notifies and maintains a digital inventory of the state's wetlands, and guides their conservation and wise use. Example: The State Wetland Authority monitors encroachment and pollution in the wetlands notified within its jurisdiction.
• National Wetlands Committee: The National Wetlands Committee is a statutory advisory body constituted by the Ministry of Environment, Forest and Climate Change under the Wetlands (Conservation and Management) Rules, 2017. It advises the central government on policies and programmes for wetland conservation, identifies wetlands of national importance and reviews their conservation status. It works alongside State Wetlands Authorities, which identify and notify wetlands at the state level. Example: The committee advises on the conservation of wetlands of national importance, including major Ramsar sites.
• Amrit Dharohar: Amrit Dharohar is an initiative announced in the Union Budget 2023-24 and launched in June 2023 by the Ministry of Environment, Forest and Climate Change jointly with the Ministry of Tourism. It aims to promote the unique conservation values of India's Ramsar sites while generating employment and local livelihoods through nature tourism, with communities as caretakers of the wetlands. Its components cover species and habitat conservation, nature tourism, wetlands livelihoods, and wetlands carbon. Example: Five pilot sites were identified for community skill development under the Alternative Livelihood Programme: Sultanpur (Haryana), Chilika and Bhitarkanika (Odisha), and Sirpur and Yashwant Sagar (Madhya Pradesh).
• State Wetland Authorities: State Wetland Authorities are bodies constituted under the Wetlands (Conservation and Management) Rules 2017 in every state and union territory. They identify and notify wetlands in the state, maintain a digital inventory, recommend prohibited and regulated activities around wetlands, and oversee their wise use and conservation. Example: A State Wetland Authority prepared the brief document for its state's Ramsar site proposal.
• Key takeaways: Key takeaways is a quick-revision summary box placed at the end of each article, listing the most exam-relevant points in a short numbered list. It distils definitions, dates, figures, provisions and examples into a form suited for last-minute revision before Prelims and Mains. Together with the article's practice questions, it turns every topic into a self-contained study unit.
• National Plan for Conservation of Aquatic Ecosystems (NPCA): The National Plan for Conservation of Aquatic Ecosystems is an integrated conservation scheme launched in February 2013 by merging the National Wetlands Conservation Programme and the National Lake Conservation Plan. It provides central assistance to states for the conservation and management of identified wetlands and lakes, including pollution control, catchment treatment and biodiversity conservation. The merger aimed to bring synergy and avoid duplication between the two earlier schemes. Example: States receive central assistance under NPCA for catchment treatment and biodiversity conservation in identified wetlands and lakes.
• National Wetland Inventory and Assessment: The National Wetland Inventory and Assessment (NWIA) is a MoEF sponsored project implemented by ISRO's Space Applications Centre, Ahmedabad, that mapped India's wetlands at 1:50,000 scale using satellite remote sensing. The first atlas (released 2011) mapped 7,57,060 wetlands covering 15.26 million hectares (4.63 percent of the country's area), and a second cycle National Wetland Decadal Change Atlas comparing 2006-07 and 2017-18 was released in 2022. Example: The 2022 decadal atlas estimated wetland area at 15.98 million hectares, about 4.86 percent of India's geographical area.
• Nine Ramsar criteria: The nine Ramsar criteria are the tests of which a wetland must meet at least one to be listed as a Wetland of International Importance, ranging from a rare wetland type to regularly supporting 20,000 waterbirds. Example: a small lake holding 1 percent of a waterbird population qualifies under Criterion 6.
• Victoria Falls Declaration: The Victoria Falls Declaration is the political declaration adopted at Ramsar COP15 in Zimbabwe in July 2025, committing parties to restore degraded freshwater ecosystems and strengthen listing criteria. Example: it anchors the Convention's strategic plan of four goals and 18 targets.
• Mission LiFE: Mission LiFE (Lifestyle for Environment) is India's initiative, launched at UNFCCC COP26, that frames everyday consumption and behaviour choices as climate and conservation action. Example: India's Ramsar COP15 resolution carried Mission LiFE into global wetland policy.

Prelims practice