Wetlands & Ramsar Sites
Wetlands & Ramsar Sites
Wetlands are transitional ecosystems between terrestrial and aquatic environments where the water table is at or near the surface, or the land is covered by shallow water. India has an estimated 757,060 wetlands covering 4.63% of its geographic area. The Ramsar Convention (1971) is the international treaty for the conservation of wetlands. India, with 85 Ramsar Sites (as of 2024), has the highest number of Ramsar Sites in South Asia.
Key Dates
Ramsar Convention signed in Ramsar, Iran — the first modern intergovernmental treaty on environmental conservation
India became a party to the Ramsar Convention; Chilika Lake (Odisha) and Keoladeo NP (Rajasthan) were first Indian Ramsar Sites
India has 85 Ramsar Sites — the highest in South Asia; total area ~13.3 lakh hectares
World Wetlands Day — celebrated annually on February 2, marking the date of the Ramsar Convention signing
India has ~757,060 wetlands covering ~15.26 million hectares (4.63% of geographic area)
Wetlands (Conservation and Management) Rules notified — replaced 2010 rules; State Wetland Authorities established
Largest coastal lagoon in India (1,100 sq km, Odisha); Ramsar site; Irrawaddy dolphins; removed from Montreux Record in 2002
Register of Ramsar sites where ecological character has changed — 2 Indian sites on it: Loktak Lake and Keoladeo
What Are Wetlands — Types and Classification
Wetlands are 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 (Ramsar Convention definition). They are among the most productive ecosystems on Earth, often called "biological supermarkets" for their role in supporting food chains and biodiversity. Classification of wetlands: By water source and type: (1) Inland Wetlands — lakes, rivers, floodplains, marshes, swamps, and peatlands fed by rain, rivers, or groundwater; (2) Coastal Wetlands — estuaries, lagoons, mangroves, coral reefs, and salt marshes influenced by tidal waters. By origin: (1) Natural Wetlands — formed by geological and hydrological processes; (2) Man-made/Artificial Wetlands — reservoirs, tanks, ponds, canals, paddy fields, and fish ponds. India's wetland inventory (National Wetland Atlas by ISRO-SAC, 2011): Total: 757,060 wetlands covering 15.26 million hectares; Inland wetlands: 693,918 (91.7%) covering 14.16 million hectares; Coastal wetlands: 63,142 (8.3%) covering 1.10 million hectares; Natural wetlands: 451,818; Man-made wetlands: 305,242; by size: 2,175 large wetlands (>225 hectares), 27,403 medium (2.25-225 hectares), and 727,482 small (<2.25 hectares). Major wetland types in India: high-altitude lakes in Ladakh and the Himalayas (e.g., Pangong Tso, Tso Moriri, Tso Kar — saline/brackish lakes), riverine floodplains (Ganga, Brahmaputra), coastal lagoons (Chilika, Pulicat, Vembanad), mangrove wetlands (Sundarbans, Bhitarkanika), marshes and swamps (Kerala backwaters, Loktak Lake), and man-made reservoirs.
The Ramsar Convention and Its Framework
The Convention on Wetlands of International Importance (commonly called the Ramsar Convention) was signed on February 2, 1971, in Ramsar, Iran. It is the first modern intergovernmental treaty focused on a single ecosystem type. The Convention entered into force in 1975. As of 2024, 172 countries are Contracting Parties, and over 2,500 wetlands covering 256 million hectares have been designated as Ramsar Sites worldwide. Key features: (1) The "Wise Use" Concept — the central philosophy; wise use means maintaining the ecological character of wetlands through sustainable approaches; it does not prohibit human use but promotes sustainable management. (2) Designation Criteria — nine criteria for identifying Wetlands of International Importance; a wetland must meet at least one: Criterion 1: representative, rare, or unique wetland type; Criterion 2: supports vulnerable, endangered, or critically endangered species; Criterion 3: supports populations of plant/animal species important for biodiversity; Criterion 4: supports species at a critical stage in their life cycle or during adverse conditions; Criterion 5: regularly supports 20,000 or more waterbirds; Criterion 6: regularly supports 1% of the individuals of a waterbird species/subspecies; Criteria 7-9: for fish/indigenous species. (3) Montreux Record — a register of Ramsar Sites where ecological character has changed, is changing, or is likely to change due to human activities; it is a voluntary mechanism; two Indian sites are currently on it: Loktak Lake (Manipur) and Keoladeo NP (Rajasthan, also known as Bharatpur); Chilika Lake was on the Montreux Record but was removed in 2002 after successful restoration. (4) The Ramsar Secretariat is based in Gland, Switzerland, and works with IUCN.
India's Ramsar Sites — Overview
India has designated 85 Ramsar Sites (as of August 2024), the highest number in South Asia. Key Ramsar Sites: (1) Chilika Lake (Odisha, 1981) — largest coastal lagoon in India (~1,100 sq km); connected to Bay of Bengal; supports over 1 million migratory birds annually; Irrawaddy dolphins; removed from Montreux Record in 2002 after restoration of the mouth channel. (2) Keoladeo NP (Rajasthan, 1981) — 29 sq km; formerly a duck-hunting ground for Maharajas; UNESCO World Heritage Site; one of the world's most important bird breeding and feeding grounds; over 350 bird species including (historically) the Siberian crane (no longer winters here); on the Montreux Record. (3) Wular Lake (J&K) — largest freshwater lake in India (~130 sq km when fully flooded); on the Jhelum river; important for fish; faces siltation and encroachment. (4) Loktak Lake (Manipur) — largest freshwater lake in northeast India; famous for phumdis (floating biomass/islands of vegetation); Keibul Lamjao NP (on a phumdi) is the world's only floating national park; home to the Sangai deer; on the Montreux Record due to Ithai Barrage impacts. (5) Sambhar Lake (Rajasthan) — India's largest inland saline lake (~230 sq km); important for flamingos and other migratory birds; salt production. (6) Vembanad-Kol Wetland (Kerala) — largest Ramsar site in India at the time of designation (~1,512 sq km); includes Vembanad Lake (longest lake in India at 96.5 km); Kumarakom bird sanctuary; annual Nehru Trophy Boat Race (snake boat race).
More Key Ramsar Sites and Recent Additions
India has rapidly expanded its Ramsar designations, adding many sites since 2019: Tamil Nadu leads with 16 Ramsar Sites (as of 2024) — the most of any state. Key additions include: Karikili Bird Sanctuary (TN), Pallikaranai Marsh (TN — urban wetland in Chennai), Vedanthangal Bird Sanctuary (TN — one of India's oldest bird sanctuaries), Point Calimere (TN), Suchindram Theroor Wetland Complex (TN). Other major recent Ramsar Sites: Deepor Beel (Assam) — Important Bird Area; Bhoj Wetland/Upper Lake (Bhopal, MP) — largest artificial lake in Asia when first built; Tsomoriri (Ladakh) — high-altitude lake at 4,595 m, breeding ground for black-necked crane; Harike Wetland (Punjab) — confluence of Satluj and Beas rivers; Indira Gandhi Wetland (India's largest man-made wetland); Sultanpur NP (Haryana); Bhitarkanika Mangroves (Odisha — second-largest mangrove in India; saltwater crocodile); Sunderban Wetland (West Bengal); East Kolkata Wetlands (West Bengal — unique example of a resource recovery wetland where sewage is treated through natural biological processes — fish ponds and garbage farms; declared a Ramsar site in 2002); Asan Conservation Reserve (Uttarakhand — India's first Ramsar site from Uttarakhand); Khijadia Bird Sanctuary (Gujarat); Thol Lake (Gujarat). Uttar Pradesh has 10 Ramsar Sites including Nawabganj, Parvati Agra, Saman, Samaspur, Sur Sarovar (Keetham Lake, Agra). Rajasthan has important sites including Sambhar Lake, Keoladeo NP, and several recent additions. The rapid expansion of Ramsar sites (from 27 in 2014 to 85 in 2024) reflects India's increased focus on wetland conservation.
Ecological Functions and Services of Wetlands
Wetlands provide critical ecosystem services that benefit both nature and human societies: (1) Water Storage and Flood Control — wetlands act as natural sponges, absorbing and storing excess water during heavy rainfall and floods, then slowly releasing it; floodplain wetlands along the Ganga and Brahmaputra reduce downstream flooding; the East Kolkata Wetlands protect Kolkata from flooding; estimated that wetlands prevent billions of rupees in flood damage annually. (2) Groundwater Recharge — wetlands percolate water downward, replenishing aquifers; particularly important in semi-arid regions. (3) Water Purification — wetlands filter pollutants, excess nutrients, and sediments from water through natural biological, physical, and chemical processes; the East Kolkata Wetlands naturally treat about 680 million litres of Kolkata's sewage daily. (4) Carbon Sequestration — wetlands, especially peatlands, store enormous amounts of carbon; peatlands cover only 3% of global land but store twice as much carbon as all forests combined; mangrove wetlands sequester 5-10 times more carbon per hectare than terrestrial forests (blue carbon). (5) Biodiversity Support — wetlands support a disproportionate share of global biodiversity; freshwater wetlands cover ~1% of Earth's surface but support ~12% of all animal species and ~40% of all species that breed or live in freshwater; in India, wetlands support migratory waterbirds on the Central Asian Flyway (connecting Siberia to India and Africa), resident birds, fish, amphibians, reptiles, and mammals. (6) Fisheries and Livelihoods — inland fisheries in wetlands contribute about 60% of India's fish production; Chilika Lake alone supports the livelihoods of about 200,000 fishermen. (7) Climate Regulation — through evapotranspiration, wetlands moderate local temperatures and humidity.
Threats to Indian Wetlands
India's wetlands face severe and accelerating threats: (1) Encroachment and Land Conversion — urban expansion, agriculture, and construction on wetland areas; Pallikaranai Marsh in Chennai has shrunk from 5,000+ hectares to about 750 hectares; Deepor Beel in Guwahati is surrounded by encroachment; across India, thousands of small wetlands have disappeared entirely. (2) Pollution — industrial effluents, untreated sewage, agricultural runoff (pesticides, fertilizers), and solid waste degrade water quality; Yamuna floodplain wetlands near Delhi are severely polluted; eutrophication (excess nutrients) causes algal blooms and oxygen depletion. (3) Siltation — accelerated soil erosion from deforested catchments increases sediment inflow, reducing wetland depth and area; Wular Lake has lost about 30% of its area to siltation and willow plantation encroachment. (4) Invasive Species — water hyacinth (Eichhornia crassipes) chokes many Indian wetlands, blocking sunlight, depleting oxygen, and preventing navigation; Loktak Lake is severely affected by the Ithai Barrage (which stabilized water levels, paradoxically causing phumdi deterioration) and invasive plants. (5) Hydrological Alteration — dams, barrages, and canal diversions alter water flow to wetlands; groundwater over-extraction lowers water tables, drying up wetlands; the Ithai Barrage on Loktak Lake disrupted its natural hydrology. (6) Climate Change — altered rainfall patterns, increasing temperatures, and changing monsoon timing affect wetland hydrology and ecology. (7) Over-exploitation — overfishing, excessive reed harvesting, and sand mining in and around wetlands. According to the Wetlands International South Asia, India has lost about 30% of its natural wetland area in the last three decades.
Wetland Conservation in India — Legal and Institutional Framework
India's wetland conservation framework has evolved significantly: (1) Wetlands (Conservation and Management) Rules, 2017 — notified under the Environment Protection Act, 1986; replaced the 2010 rules; requires each state/UT to establish a State Wetland Authority (SWA) headed by the Environment Minister; prohibits encroachment, industrial effluent discharge, solid waste dumping, and construction (except as permitted) in notified wetlands; mandates the preparation of an Integrated Management Plan for each identified wetland; all Ramsar sites and wetlands identified by state authorities are covered. (2) National Wetland Conservation Programme (NWCP) — launched in 1985-86 by the Ministry of Environment; covers 115 wetlands in 24 states; activities include catchment treatment, weed removal, de-silting, and community awareness; since 2018, merged into the National Plan for Conservation of Aquatic Eco-systems (NPCA) which also covers lakes and tanks. (3) National Plan for Conservation of Aquatic Eco-systems (NPCA, 2015) — merged the NWCP and National Lake Conservation Plan; a single conservation scheme for wetlands, lakes, and tanks; focuses on pollution abatement, catchment conservation, and sustainable management. (4) The National Environment Policy (2006) recognizes wetlands as sensitive ecosystems requiring protection. (5) Other applicable laws: Wildlife Protection Act (for wetlands in PAs), Water (Prevention and Control of Pollution) Act (water quality), Forest Conservation Act (for forested wetlands), CRZ Notification (for coastal wetlands), Environmental Impact Assessment (EIA) for development projects near wetlands. Institutional setup: Ministry of Environment, Forest and Climate Change (MoEFCC) is the nodal ministry; the Space Applications Centre (SAC/ISRO) conducts satellite-based wetland inventories; the National Centre for Sustainable Coastal Management (NCSCM) advises on coastal wetlands; the Wetlands International South Asia (a branch of the global NGO) supports research and advocacy.
Relevant Exams
Wetlands and Ramsar sites are high-frequency topics across all competitive exams. UPSC regularly asks about specific Ramsar sites (location, features), the Montreux Record, Ramsar Convention criteria, and wetland ecosystem services. SSC/RRB exams test factual recall — number of Ramsar sites, first Ramsar sites (Chilika, Keoladeo), largest wetlands, and state-specific sites. Questions on the Wetlands Rules 2017, Loktak Lake, East Kolkata Wetlands, and the difference between NP/WS/CR are common.