BharatNotes
What Are Wetlands?
The Ramsar Convention (1971) defines wetlands as:
"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 the depth of which at low tide does not exceed 6 metres."
This definition deliberately includes coastal and shallow marine areas alongside the more commonly understood inland wetlands.
Types of Wetlands
Wetlands are broadly classified into natural and human-made categories:
Natural Wetlands
| Category | Examples |
|---|---|
| Marshes | Freshwater marshes dominated by emergent herbaceous plants; floodplain marshes |
| Swamps | Dominated by woody plants (trees/shrubs); seasonally or permanently waterlogged |
| Bogs | Peat-forming; acidic; fed by rainwater only (ombrotrophic); Sphagnum moss-dominated |
| Fens | Peat-forming; fed by groundwater or surface water; less acidic than bogs |
| Floodplains | Areas flooded by river overflow; highly productive; support seasonal agriculture |
| Mangroves | Coastal saltwater wetlands; halophytic trees; estuarine environments |
| Coral Reefs | Marine; shallow tropical waters; biologically the most diverse marine ecosystem |
| Estuaries | Where rivers meet sea; mixing of fresh and salt water; highly productive nursery grounds |
| Lakes & Ponds | Freshwater standing water bodies; seasonal or permanent |
Human-Made Wetlands
Reservoirs (dams), rice paddies, sewage treatment ponds, aquaculture ponds, salt pans, and irrigation canals.
Ecosystem Services of Wetlands
Wetlands are among the most economically valuable ecosystems on Earth, providing:
| Service | Description |
|---|---|
| Water purification | Filter pollutants, sediments, and nutrients through biological and physical processes |
| Flood regulation | Absorb and slow floodwaters; protect downstream communities |
| Groundwater recharge | Replenish aquifers; sustain dry-season flows in rivers |
| Carbon sequestration | Peatlands store more carbon per unit area than tropical forests; mangroves are "blue carbon" sinks |
| Biodiversity support | Support 40% of the world's species including migratory birds, freshwater fish, amphibians |
| Livelihood support | Fisheries, agriculture, tourism, medicinal plants |
| Shoreline stabilisation | Mangroves buffer coasts from storms and tsunamis |
Despite covering only ~6% of the Earth's surface, wetlands support enormous ecological and economic value. The Millennium Ecosystem Assessment (2005) found wetlands among the most degraded ecosystems globally.
Ramsar Convention
Overview
The Convention on Wetlands of International Importance especially as Waterfowl Habitat — commonly called the Ramsar Convention — was signed on 2 February 1971 in Ramsar, Iran. It is the oldest international environmental treaty still in operation.
- World Wetlands Day: 2 February (anniversary of Ramsar signing)
- India ratified the Ramsar Convention in 1982
- Secretariat: Gland, Switzerland (hosted by IUCN secretariat complex)
- Conference of Parties (COP) meets every 3 years
The 9 Ramsar Criteria
A wetland is designated a Ramsar Site if it meets at least one of nine criteria:
| Criteria Group | Criteria |
|---|---|
| Representative/rare/unique | Criteria 1: Contains a representative, rare, or unique example of a natural or near-natural wetland type |
| Biodiversity — species/communities | Criteria 2 (threatened species/communities), 3 (biodiversity maintenance), 4 (critical for species at a vulnerable life cycle stage) |
| Biodiversity — waterbirds | Criteria 5 (20,000+ waterbirds regularly), 6 (1% of global/flyway population of a waterbird species) |
| Biodiversity — fish | Criteria 7 (significant for fish diversity), 8 (fish food source, spawning, nursery area) |
| Biodiversity — other taxa | Criteria 9 (1% of global population of a non-avian animal species dependent on wetlands) |
India's Ramsar Sites
India has the highest number of Ramsar sites in Asia. As of early 2026, India has 98 Ramsar sites covering approximately 13,60,805 hectares.
Tamil Nadu has the highest number of Ramsar sites among Indian states (20 sites).
Key Ramsar Sites of India
| Site | State | Significance |
|---|---|---|
| Chilika Lake | Odisha | Largest coastal lagoon in India; critical for migratory birds; first Indian Ramsar site (1981) |
| Keoladeo Ghana (Bharatpur) | Rajasthan | Former duck-shooting reserve; now a World Heritage Site; key wintering ground for Siberian cranes |
| Loktak Lake | Manipur | Largest freshwater lake in Northeast India; famous for floating Phumdis (biomass islands); Sangai deer habitat |
| Wular Lake | J&K | One of the largest freshwater lakes in Asia |
| Sambhar Salt Lake | Rajasthan | Largest inland saline lake in India; flamingo aggregation site |
| Sundarbans | West Bengal | Largest mangrove forest in the world; Tiger Reserve; also a World Heritage Site |
| Point Calimere | Tamil Nadu | Important for flamingos and shorebirds |
| Renuka Wetland | Himachal Pradesh | Highest altitude Ramsar site in India (at ~672 m) |
Recent Additions (2024–2025)
India added several new sites in 2024 and 2025:
- August 2024: Three new wetlands designated, bringing total to 85 (from 82)
- June 2025: Khichan (Rajasthan) and Menar (Rajasthan) designated, bringing total to 91
- September 2025: Gokul Jalashay and Udaipur Jheel (Bihar) added
- December 2025: Siliserh Lake (Rajasthan) and Kopra Jalashay (Chhattisgarh) added, reaching 96
- India's count reached 98 sites by early 2026
Montreux Record
The Montreux Record is a register under the Ramsar framework of Ramsar sites where ecological changes have occurred, are occurring, or are likely to occur as a result of technological developments, pollution, or other human interference.
India's sites on the Montreux Record:
- Keoladeo Ghana National Park — listed due to changes in water management and grazing pressure
- Loktak Lake — listed due to weed infestation, pollution, and changes caused by the Loktak Hydroelectric Project
Chilika Lake was placed on the Montreux Record in 1993 due to siltation and weed growth. Following significant restoration work by the Chilika Development Authority, it was removed from the Record in 2002 — making it the first site in Asia to be removed from the Montreux Record, a conservation success story.
Wetlands Conservation Rules, 2017
The Wetlands (Conservation and Management) Rules, 2017 replaced the 2010 Rules and decentralised wetland governance:
- Nodal Ministry: Ministry of Environment, Forest and Climate Change (MoEFCC)
- State Wetland Authorities constituted in each state/UT to manage wetlands (except Ramsar sites, which remain under Central oversight)
- Prohibited activities within wetlands: construction, dumping of solid waste, reclamation, diversion for non-wetland purposes
- National Wetland Conservation Programme (NWCP): Provides Central financial assistance to States for wetland conservation
Threats to Wetlands
India has lost a significant portion of its wetland area over the past century due to:
| Threat | Impact |
|---|---|
| Drainage and reclamation | Conversion to agricultural land, urban development |
| Pollution | Industrial effluents, agricultural run-off (fertilisers, pesticides), sewage |
| Invasive species | Water hyacinth (Eichhornia crassipes) chokes lakes; Salvinia molesta blocks water flow |
| Excessive water abstraction | Groundwater extraction lowers water tables; reduces seasonal wetland persistence |
| Climate change | Altered rainfall patterns; increased evaporation; glacier melt affecting Himalayan wetlands |
| Unplanned encroachment | Urban sprawl encroaches on peri-urban wetlands |
Freshwater Biodiversity Crisis
Freshwater ecosystems cover less than 1% of the Earth's surface yet support:
- ~10% of all known species on Earth
- ~33% of all vertebrate species
- Over 126,000 described species including ~18,000 fish species
Key threats to freshwater biodiversity:
- Dam construction (disrupts fish migration, alters hydrology)
- Pollution from industry and agriculture
- Overextraction of water for irrigation (Aral Sea example)
- Invasive species introduction
- Microplastic contamination
National Plan for Conservation of Aquatic Eco-systems (NPCA): A merged programme combining the earlier National Wetlands Conservation Programme and National Lake Conservation Plan. Implemented by MoEFCC, it provides assistance to states for conservation and management of identified wetlands and lakes.
Exam Strategy Note
For Prelims, always keep the current Ramsar site count updated — it changes frequently. Remember: Chilika was removed from Montreux Record (2002), Loktak and Keoladeo remain on it. For Mains, wetlands connect to climate (blue carbon), biodiversity (CBD targets), water security, and livelihood issues — use these cross-cutting links in GS3 answers. The Wetlands Rules 2017 and the decentralisation of wetland governance is relevant for federal/governance angle in GS2.
