📋 What’s Inside
- Mangroves in India — ISFR 2023 Updated
- Global Status of Mangrove Cover
- Importance of Mangroves
- Threats to Mangroves & Consequences
- MISHTI Scheme — Current Affairs
- Importance of Wetlands
- Reasons for Wetland Depletion
- Mitigation of Wetland Destruction
- Geography Links — Where & Why
- Practice MCQs
- UPSC Prelims PYQs
- FAQ
India Status
ISFR 2023
Global
World cover
Importance
Why mangroves
Threats
Causes of loss
MISHTI
2023 scheme
Depletion
Why wetlands lost
Mitigation
Solutions
Geography
Where & why
Mangroves in India ISFR 2023
sq km mangrove cover (ISFR 2023)
of India’s total geographical area
of world’s mangrove vegetation
sq km net increase since 2013
- India’s total mangrove cover: 4,991.68 sq km — 0.15% of geographical area.
- Net decrease of 7.43 sq km compared to ISFR 2021 (slight dip) — but net increase of 363.68 sq km (7.86%) since 2013.
- Net increase of 509.68 sq km (11.4%) between 2001 and 2023 — long-term positive trend.
- West Bengal — highest coverage: 42.45% (Sundarbans dominant)
- Gujarat — second: 23.66% (Gulf of Kutch, Gulf of Khambhat)
- Andaman & Nicobar Islands — third: 12.39%
- State changes (2021 to 2023): Gujarat decreased by 36.39 sq km; Andhra Pradesh increased by 13.01 sq km; Maharashtra increased by 12.39 sq km.
| Rank | State/UT | Key Location | Notable Feature |
|---|---|---|---|
| 1st — 42.45% | West Bengal | Sundarbans | World’s largest mangrove; only Tiger mangrove; UNESCO WHS |
| 2nd — 23.66% | Gujarat | Gulf of Kutch, Gulf of Khambhat | Marine NP; fastest growing under MISHTI; 799 sq km in Kutch alone |
| 3rd — 12.39% | Andaman & Nicobar | Entire island chain | Highest species richness; pristine, undisturbed mangroves |
| 4th | Andhra Pradesh | Godavari-Krishna delta | Increasing trend since 2021; major deltaic mangroves |
| 5th | Odisha | Bhitarkanika | 2nd largest in India; 55/58 species; largest Olive Ridley nesting |
| 6th | Tamil Nadu | Pichavaram, Gulf of Mannar | Pichavaram = 2nd largest mangrove forest in India (after Sundarbans) by some accounts |
| 7th | Maharashtra | Mumbai, Thane Creek | Urban mangroves; Thane Creek is a Ramsar site; increasing trend |
| — | Goa, Karnataka, Kerala | West coast estuaries | Sparse; Kerala very thin; Aghanashini (Karnataka) is a Ramsar site |
UPSC 2019 Mains directly asked: “Discuss the causes of depletion of mangroves and explain their importance in maintaining coastal ecology.” ISFR 2023 data is the standard for all mangrove-related UPSC questions. Remember: West Bengal > Gujarat > A&N Islands in terms of mangrove cover. Also: India has 58 mangrove species; Bhitarkanika has 55 of 58. The Sundarbans is named after the Sundari tree (Heritiera fomes).
Global Status of Mangrove Cover 2024
hectares globally (FAO 2023, as of 2020)
of all tropical forests globally
Indonesia’s share of world mangroves
tonnes of carbon per hectare stored
🔑 Global Mangrove Facts (State of the World’s Mangroves 2024 — Global Mangrove Alliance)
- Global mangrove extent in 2020: 14.8 million hectares (FAO 2023; Global Mangrove Watch map v4.0 shows 147,256 km²)
- Southeast Asia holds about one-third of the world’s mangroves; Indonesia alone accounts for 21% — the most of any country.
- Top 5 countries by mangrove cover: Indonesia, Brazil, Nigeria, Mexico, Australia — together hold 47% of global mangrove cover.
- India holds approximately 3.3% of world mangroves — placing it among the top 10.
- Carbon storage: Mangroves hold on average 394 tonnes of carbon per hectare in living biomass and the top meter of soil. Some areas (Philippines) exceed 650 tonnes/hectare.
- Flood reduction: Mangroves reduce flood depths by 15–20% and over 70% in some areas.
- Food security: Mangroves support nearly 800 billion young fish, prawns, bivalves, and crabs annually — critical for global fisheries.
- Natural mangrove forests on India’s southern coast (Lakshadweep, Tamil Nadu) are critically endangered due to rising sea levels.
- World Mangrove Day: 26 July every year.
India joined the Mangrove Alliance for Climate (MAC) during COP27 (Egypt, November 2022). MAC is an alliance of countries committed to expanding and protecting mangroves as a nature-based solution to climate change. This led directly to India launching the MISHTI scheme in 2023. The Global Mangrove Alliance (GMA) — 100+ member alliance — released the “State of the World’s Mangroves 2024” on World Mangrove Day (26 July 2024), providing the latest global data.
Know: Indonesia has the world’s largest mangrove cover. India is top-10 globally. Mangroves are the most carbon-rich coastal ecosystems. They store more carbon than tropical rainforests per unit area. Mangroves + Seagrasses + Salt marshes = Blue Carbon ecosystems. Connect to: climate change, carbon sequestration, Paris Agreement NDCs, COP27 MAC, and India’s MISHTI scheme.
Importance of Mangroves
Coastal Protection
Mangroves are a natural bioshield against cyclones, storm surges, and tsunamis. Their dense root systems absorb wave energy — reducing wave heights by 50–70%. A 2024 study values global mangrove flood protection at $855 billion/year. Can cut storm death tolls by two-thirds. Sundarbans protected millions during Cyclone Amphan (2020).
Blue Carbon Sequestration
Mangroves store carbon 2–4 times more efficiently than terrestrial forests per unit area. They sequester carbon in plant biomass AND in the anaerobic sediment below — where it remains locked for millennia. With only 0.5% of tropical forest area, they store disproportionate carbon. Critical for India’s NDC targets under Paris Agreement.
Fisheries & Food Security
Mangroves are “fish factories” — breeding, spawning, and nursery grounds for hundreds of commercially important fish, shrimp, and crab species. Support the livelihoods of 210 million coastal people worldwide. Over 800 billion juvenile aquatic organisms rely on mangroves annually. Loss of mangroves directly reduces coastal fish catches.
Biodiversity Hotspot
Indian mangrove ecosystems house 5,746 species (ZSI/GMA 2024 data) — possibly the highest biodiversity of any mangrove country. 4,822 (84%) are animals. Hosts Royal Bengal Tiger, saltwater crocodile, Olive Ridley turtle, fishing cat, Irrawaddy dolphin. Critical habitat for endangered Dugong in Andaman.
Water Purification
Mangrove roots act as natural filters — trapping sediments, absorbing excess nutrients (nitrogen, phosphorus) from agricultural runoff before they reach coral reefs and seagrass beds. They protect coral reefs from bacterial run-off. Remove pollutants and heavy metals from coastal water.
Coastal Erosion Prevention
Mangrove roots bind coastal sediment, preventing erosion of beaches, mudflats, and deltas. Their prop roots trap sediment carried by tidal currents, actually building land over time. They protect agricultural land, roads, and settlements from saltwater intrusion and sea level rise.
Livelihoods & Economy
Provide timber, fuelwood, charcoal, honey (Sundarbans Mouli community), medicinal plants, dyes (tannin from bark), and thatching materials. Support ecotourism — boat tours, birdwatching (Bhitarkanika, Pichavaram). Traditional communities like the Mawali honey collectors of Sundarbans depend entirely on mangroves.
Nutrient Cycling
Mangrove leaf litter decomposes into detritus — the base of the coastal food web. Feeds worms, crabs, oysters, shrimp, and mullet — which in turn feed fish and birds. Mangroves enhance natural recycling of nutrients between land and sea, maintaining high coastal productivity.
⭐ Importance of Mangroves — MAINS Answer Points
- Coastal protection: $855 billion flood protection globally; reduces waves 50–70%
- Blue carbon: 2–4× more carbon than tropical forests; stores 394 tonnes C/hectare
- Fisheries: 210 million livelihoods; 800 billion juvenile organisms annually
- Biodiversity: 5,746 species in India; home to Bengal Tiger, Olive Ridley, Dugong
- Water purification: filters nutrients; protects coral reefs
- Erosion control + land building: roots trap sediment
- Livelihoods: honey, timber, ecotourism, medicinal plants
Threats to Mangroves & Consequences 2024 Data
- Aquaculture (shrimp farming): 26% of global mangrove loss 2000–2020 — largest single cause.
- Agriculture (oil palm + rice cultivation): 43% — combined the biggest driver.
- Natural mangroves on India’s southern coast (Lakshadweep, Tamil Nadu) are critically endangered due to rising sea levels.
Shrimp Aquaculture
Conversion of mangroves to shrimp ponds — massive in AP, WB, TN, Gujarat. Aquaculture = 26% of all global mangrove loss 2000–2020.
Agricultural Conversion
Rice paddies and oil palm plantations replacing mangroves — especially in Southeast Asia. 43% of global loss.
Coastal Development
Ports, urban expansion, roads, hotels, and industrial zones encroach on mangrove areas. Mumbai’s coastal development threatens Thane Creek mangroves.
Sea Level Rise
Mangroves cannot migrate inland fast enough when hemmed in by human settlements. Southern India’s mangroves (Lakshadweep, TN) critically endangered.
Pollution
Oil spills (Niger Delta, Mumbai coast), industrial effluents, and plastic debris smother roots and prevent gas exchange. Kills mangroves by anoxia.
Cyclones
Severe cyclones physically destroy forests. Increasing cyclone frequency and intensity due to climate change amplifies this threat. Ironically, intact mangroves protect from cyclones.
Invasive Species
Prosopis juliflora (invasive shrub) in Tamil Nadu and Sri Lanka outcompetes mangroves, alters salinity, reduces freshwater availability. Hard to eradicate.
Overexploitation
Unsustainable timber harvesting, fuelwood collection, and tannin extraction from bark. Particularly in areas with poor enforcement of CRZ regulations.
Crabs & Pests
Damage by crabs, oysters, and pests to young mangrove seedlings undermines restoration efforts. Overgrazing by livestock near mangrove areas.
🔑 Consequences of Mangrove Loss
- Coastal vulnerability: Loss of natural barrier → higher flood damage, cyclone deaths, coastal erosion. Villages that had 5 miles of mangroves between them and the sea in the 1950s now sit at the water’s edge.
- Fisheries collapse: Loss of nursery grounds → 10–15% decline in coastal fish catches per hectare of mangroves lost. Food insecurity for coastal communities.
- Carbon release: Destroying mangroves releases carbon stored in both biomass AND sediment — some of which has been locked away for thousands of years.
- Biodiversity loss: Species dependent on mangroves (Tiger, Dugong, Olive Ridley) lose critical habitat.
- Saltwater intrusion: Without mangrove root barriers, saltwater penetrates inland, contaminating agricultural land and freshwater sources.
- Loss of livelihoods: Millions of fishing and forest-dependent communities lose their livelihood base.
MISHTI Scheme Current Affairs 2023
🌿 MISHTI — Mangrove Initiative for Shoreline Habitats & Tangible Incomes
Full Name: Mangrove Initiative for Shoreline Habitats & Tangible IncomesCoverage: 11 coastal States and 2 Union Territories. Key focus: Sundarbans (WB), Hooghly Estuary (WB), Gulf of Kutch (Gujarat), Gulf of Khambhat, Odisha, Maharashtra, Tamil Nadu, Kerala, Karnataka, Goa, Andhra Pradesh, Lakshadweep, Andaman & Nicobar.
Gujarat achievement: Gujarat has already planted 190 sq km (19,020 hectares) in just two years — significantly ahead of its proportional target. Gujarat is India’s current leader in mangrove afforestation under MISHTI.
🔑 Why MISHTI was Launched — Context
- India joined the Mangrove Alliance for Climate (MAC) at COP27 (Sharm el-Sheikh, Egypt, November 2022) — committing to expand mangroves as a climate solution.
- MISHTI directly implements India’s MAC commitment and aligns with India’s NDC under the Paris Agreement (creating 2.5–3 billion tonnes additional carbon sink by 2030).
- India also launched Amrit Dharohar scheme (Budget 2023-24) simultaneously — for wetland conservation and ecotourism at 75 Ramsar sites over 3 years.
- CRZ Notification 2019 classifies mangroves as Ecologically Sensitive Areas (ESAs) — only very limited activities allowed. A 50-metre buffer zone (CRZ-IA) is mandated around mangroves >1,000 sq m.
- If mangroves are damaged during development, three times the number lost must be replanted under CRZ provisions.
MISHTI, MAC (COP27), Amrit Dharohar, and ISFR 2023 mangrove data are all high-priority current affairs for UPSC 2026. Key facts: MISHTI = Launched 5 June 2023 = 540 sq km target = 2023-2028 = CAMPA + MGNREGS funding = MoEFCC. Also know: GCF-ECRICC project (Green Climate Fund-assisted, in AP, Maharashtra, Odisha) for mangrove restoration since 2019. Amrit Dharohar = 3-year scheme for 75 Ramsar sites — ecotourism + biodiversity + carbon.
Importance of Wetlands
Wetlands are called kidneys of the Earth (filter water), supermarkets of biodiversity (rich in species), carbon sponges (store more carbon than forests per unit area), and natural insurance against floods and droughts. They serve all four SDG-linked ecosystem services simultaneously.
🔑 Ecological Importance
- Biodiversity: Wetlands cover ~6% of Earth’s land but support 20% of all known plant and animal species. Critical stopover for migratory birds on global flyways.
- Flood control: Natural sponges — absorb excess monsoon rain and release slowly, reducing downstream flooding. 1 hectare of wetland can store up to 1.5 million litres of water.
- Water purification: Filter pollutants, sediments, and excess nutrients — the “kidney” function. East Kolkata Wetlands naturally purify the city’s sewage.
- Carbon storage: Peatlands (a type of wetland) store twice as much carbon as all the world’s forests combined despite covering only 3% of land.
- Groundwater recharge: Allow water to percolate and refill underground aquifers — critical in drought-prone regions.
- Shoreline stabilisation: Coastal wetlands (mangroves, salt marshes) anchor coastal soils and prevent erosion.
- Climate regulation: Regulate local temperature and humidity; release water vapour; influence rainfall patterns.
🔑 Economic & Social Importance
- Food production: Rice paddies (a man-made wetland) feed more than half the world’s population. Freshwater fisheries in wetlands supply protein to billions.
- Water supply: Many of the world’s major cities depend on wetlands for their drinking water supply — wetland-fed rivers and aquifers.
- Livelihoods: Over 1 billion people depend on wetlands for their livelihoods — fishing, agriculture, tourism, and extraction of resources.
- Tourism and recreation: India’s wetlands attract millions of tourists — Kerala backwaters (7 million/year), Dal Lake, Chilika Lake bird watching, Sundarbans tours.
- Traditional and cultural value: Sacred groves, sacred lakes (Khecheopalri in Sikkim), cultural heritage, spiritual significance for many communities.
- Natural disaster reduction: Wetlands buffer coastal communities from storms, tsunamis, and floods — reducing disaster damage costs.
- Sundarbans & cyclone protection: Sundarbans acts as a buffer protecting Kolkata and coastal Bengal from Bay of Bengal cyclones — critical geography-ecology link.
- Chilika Lake & fisheries: Chilika supports 1.5 lakh+ fishermen — demonstrating how wetlands underpin coastal economies directly.
- Himalayan wetlands & water: High-altitude wetlands (Pangong Tso, Tsomoriri, Chandra Taal) are critical for Himalayan river hydrology — fed by glaciers and snowmelt, they regulate downstream flow.
- Western Rajasthan wetlands: Sambhar Lake, Khichan — critical stopovers on the Central Asian Flyway for migratory birds (flamingoes, cranes, ducks).
Reasons for the Depletion of Wetlands
64% of the world’s wetlands have disappeared since 1900 — a catastrophic loss happening 3 times faster than tropical forests. India has lost over 30% of its wetlands in the past 70 years. The causes are both human (dominant) and natural.
Agricultural Conversion
Draining wetlands for paddy cultivation, aquaculture ponds, and farmland — largest driver globally. 70% of India’s wetland area is already under paddy cultivation. Jharkhand, Odisha, and Bengal wetlands converted for agriculture.
Urbanisation & Encroachment
Rapid urban growth converts wetlands to residential, commercial, and industrial zones. Chennai (Pallikaranai Marsh), Mumbai (Thane Creek), Bengaluru (loss of 90% of urban lakes since 1960) are stark examples.
Industrial Pollution
Effluents from industries discharge heavy metals, chemicals, and toxins into wetlands. Oil refineries near coastal wetlands, leather tanneries near inland wetlands — contaminate soil and water, making them uninhabitable for wildlife.
Sewage Discharge
Untreated municipal sewage introduces excess nutrients → eutrophication → algal blooms → oxygen depletion → death of aquatic life. Dal Lake (Kashmir) severely affected. Loktak Lake in Montreux Record partly due to this.
Overexploitation
Overfishing depletes fish stocks. Excessive extraction of water, sand, gravel, and wetland products beyond sustainable limits. Depletion of mangroves for fuelwood and charcoal.
Invasive Species
Water hyacinth (Eichhornia crassipes) — grows rapidly, blocks sunlight, depletes oxygen. Covers lakes like Loktak, Dal, and Vembanad. Also: Salvinia, water lettuce, Prosopis juliflora.
Dam Construction
Upstream dams reduce freshwater flow to downstream wetlands, increasing salinity and disrupting sediment supply. Reduced flow of the Ganga has altered estuarine ecology of Sundarbans. Many estuaries degraded by dam-reduced flows.
Groundwater Extraction
Over-pumping of groundwater lowers the water table, drying up wetlands from below. Ramsar sites like Keoladeo (Rajasthan) have suffered from both reduced surface water inflow AND groundwater extraction in the region.
Climate Change
Altered monsoon patterns reduce or shift rainfall away from wetland catchments. Increased evaporation due to warming dries wetlands. More frequent and intense droughts stress wetland ecosystems.
Sea Level Rise
Coastal wetlands (mangroves, salt marshes) submerged by rising seas faster than they can migrate inland — especially where human development blocks landward migration. Threat to Sundarbans, Kerala backwaters, A&N Islands.
Siltation
Deforestation in catchment areas increases erosion and sediment load in rivers. Silt deposits fill wetlands, making them shallower and eventually converting them to dry land. Accelerated by land degradation in upper catchments.
Natural Succession
Left undisturbed, wetlands naturally undergo ecological succession — filling up with organic matter and sediment over time, eventually becoming dry land (hydrosere). Accelerated by human activities that increase sediment load.
- Loktak Lake (Manipur): Depletion from invasive species (water hyacinth), encroachment on phumdis, and altered hydrology from Loktak Hydroelectric Project — in Montreux Record.
- Keoladeo NP (Rajasthan): Depletion from reduced water supply due to Panchna Dam disputes — Ramsar Montreux Record. Shows how upstream water use decisions affect downstream wetlands.
- Vembanad Lake (Kerala): Eutrophication from agricultural runoff + encroachment from land reclamation for paddy cultivation (Kuttanad — farming below sea level).
- Dal Lake (Kashmir): Severe pollution from sewage of Srinagar + encroachment + water hyacinth invasion — a textbook example of urban wetland depletion.
- Bengaluru lakes: Lost 90%+ of wetlands since 1960 to urban expansion — from 262 lakes in 1961 to fewer than 81 functioning lakes today.
Mitigation of Wetland Destruction
Legal & Regulatory Framework
Strict enforcement of Wetlands Rules 2017, CRZ Notifications, Wildlife Protection Act. Zero tolerance for encroachment. Make destruction a criminal offence with real penalties.
Ecological Restoration
Active restoration of degraded wetlands — mangrove replanting (MISHTI), seagrass restoration, removal of invasive species (water hyacinth mechanical/biological control), bioremediation of polluted wetlands.
Community Participation
Involve local fishing communities, forest communities, and tribal groups as stewards of wetlands. Community-based monitoring (Mission Sahbhagita). Sustainable livelihood alternatives that depend on healthy wetlands (ecotourism, sustainable fishing).
Economic Instruments
Payment for Ecosystem Services (PES) — paying upstream farmers to protect wetland catchments. Wetland conservation bonds. Removing perverse subsidies that incentivise wetland conversion. CAMPA funds for restoration.
Scientific Management
Wetland conservation plans (mandated under Rules 2017). Satellite monitoring (ISFR biennial assessment). Drone surveillance. Eutrophication management — reducing nutrient inflow. Controlled water-level management.
Government Schemes
MISHTI (2023–28) — mangrove restoration. Amrit Dharohar (2023) — 75 Ramsar sites ecotourism + conservation. NPCA — wetland and lake conservation. GCF-ECRICC — climate-resilient coastal ecosystems in 3 states.
International Cooperation
Ramsar Convention wise use principle. Mangrove Alliance for Climate (MAC — COP27). REDD+ for wetland carbon. Blue Carbon Initiative. Kunming-Montreal Global Biodiversity Framework (GBF) — 30×30 target (protect 30% of Earth by 2030).
Education & Awareness
World Wetlands Day (2 Feb), World Mangrove Day (26 July) awareness campaigns. Mission Sahbhagita citizen science. Save Wetlands campaign. Integrating wetland conservation into school curricula in coastal districts.
Sustainable Aquaculture
SAIME model (Sundarbans) — integrating 5–30% mangrove coverage in shrimp ponds. Won FAO Global Technical Recognition. Replaces destructive aquaculture with ecosystem-compatible methods. Shrimp farming WITH mangroves, not instead of them.
Amrit Dharohar is a 3-year scheme (2023–2026) for optimal use and conservation of 75 Ramsar sites across India. Objectives: (1) Promote unique conservation values of wetlands. (2) Enhance biodiversity, carbon stock, and ecotourism. (3) Develop nature and culture-based tourism. (4) Community stewardship for wetland livelihoods. (5) Convergence with different ministries. Launched alongside MISHTI in Budget 2023-24, it represents India’s integrated approach to wetland conservation.
⭐ Key Mitigation Schemes — Exam Summary
- MISHTI: Mangrove restoration | 540 sq km | 2023–28 | MoEFCC | CAMPA+MGNREGS
- Amrit Dharohar: 75 Ramsar sites | 3 years (2023–26) | ecotourism + biodiversity + carbon
- NPCA: National Plan for Conservation of Aquatic Ecosystems | merger of NWCP + NLCP
- GCF-ECRICC: Green Climate Fund-assisted | AP+Maharashtra+Odisha | 10,575 ha target
- SAIME: Sustainable Aquaculture in Mangrove Ecosystems | Sundarbans | FAO recognition
- MAC: Mangrove Alliance for Climate | India joined at COP27 (2022, Egypt)
- Wetland Rules 2017: State Wetland Authorities | decentralised | conservation plans mandatory
Geography Links GS-1 Connected
Mangrove and wetland questions in UPSC often blend Environment (GS-3) with Geography (GS-1). The examiner expects you to know where mangroves and wetlands are, why they are there (climate, river, coast, landform), and how geographic factors shape their ecology and threats.
🌊 Deltas & Mangroves — The Geography Connection
Mangroves grow where rivers meet the sea — in deltas and estuaries that provide the sheltered, shallow, muddy substrate they need. In India, all major delta mangrove systems are on the east coast (where rivers like Ganga, Godavari, Krishna, Mahanadi, Cauvery build large deltas) because:
- East coast rivers drain the large Deccan plateau — carrying heavy sediment loads.
- The Bay of Bengal is a low-energy sea for these rivers (unlike the Arabian Sea on the west coast, which is more wave-exposed).
- The wide, flat coastal plains of Andhra Pradesh and Odisha provide ideal intertidal zones.
- West coast mangroves are sparser because west coast rivers are shorter, steeper (Ghats), and carry less sediment. Estuaries are narrower.
🌡️ Climate & Mangrove Distribution
- Mangroves require mean annual temperatures above 20°C — they cannot survive frost. This limits them to tropical and subtropical coasts (roughly 25°N to 25°S).
- India’s mangroves are concentrated on coasts receiving monsoon rainfall — the Sundarbans (Bengal, ~1800mm/year), Bhitarkanika (Odisha), and Andaman Islands (high rainfall).
- Gujarat has extensive mangroves despite lower rainfall because the Gulf of Kutch and Gulf of Khambhat provide protected, shallow, muddy bays — perfect for mangroves despite semi-arid climate.
- Kerala mangroves are sparse because high wave energy on the Kerala coast from the SW monsoon prevents establishment of extensive mangrove communities.
- Lakshadweep mangroves are critically endangered because coral reef islands have very shallow soils and very limited intertidal area — small buffers against sea level rise.
🌱 Vegetation Zones — Geography + Ecology Together
UPSC GS-1 asked (2014): “Which one of the following regions of India has a combination of mangrove forest, evergreen forest and deciduous forest?” — Answer: Andaman and Nicobar Islands. The islands have all three because of their location (tropical latitude), high rainfall year-round (evergreen), seasonally drier zones (deciduous), and protected coastal lagoons (mangroves).
- The Sundarbans: mangrove + tidal forest + swamp — purely coastal, no highland forests.
- Western Ghats foothills: evergreen + semi-evergreen + mangroves along estuaries (Aghanashini, Zuari, Mandovi).
- Odisha coast: mangrove + tropical dry deciduous — the inland vegetation transitions.
📍 Indian Coastal Geography — Mangrove Locations to Know
- Sundarbans — Ganga-Brahmaputra-Meghna delta, West Bengal/Bangladesh. Bay of Bengal.
- Bhitarkanika — Mahanadi delta, Odisha coast. Bay of Bengal.
- Godavari-Krishna delta — AP east coast. Bay of Bengal. Second-highest state mangrove cover.
- Pichavaram — Tamil Nadu coast, near Chidambaram. Second-largest mangrove patch in India by some assessments.
- Gulf of Kutch — Gujarat, Arabian Sea. Marine NP. Semi-arid climate but sheltered gulf.
- Gulf of Khambhat — Gujarat, Arabian Sea. Important mangrove zone.
- Andaman & Nicobar — Bay of Bengal. Highest species diversity.
- Lakshadweep — Arabian Sea. Critically endangered — coral reef islands, sea level rise threat.
- Kerala backwaters — Vembanad, Ashtamudi — mangroves sparse but seagrasses rich.
- Aghanashini Estuary — Karnataka west coast. Free-flowing river estuary, Ramsar site.
| Coast/Region | Why Mangroves Here | Why Sparse/Absent | Key Geographic Factor |
|---|---|---|---|
| East coast (Sundarbans, Odisha, AP) | Large delta systems; sheltered Bay of Bengal; heavy sediment load; warm temperatures | — | Major rivers (Ganga, Godavari, Mahanadi) building wide, muddy deltas |
| Gujarat (Gulf of Kutch) | Sheltered gulf; warm climate; ideal mudflats despite low rainfall | — | Semi-enclosed gulf = low wave energy = ideal mangrove habitat |
| Kerala coast | Some estuaries have mangroves | Very sparse — high wave energy from SW monsoon; steep rivers | Western Ghats creates steep rivers; high wave exposure = difficult for mangroves |
| Andaman & Nicobar | High rainfall; sheltered lagoons; biodiversity corridor | — | Tropical island location; protected coves and bays |
| Lakshadweep | Some presence in lagoon areas | Critically endangered — tiny coral islands; very limited intertidal zone | Sea level rise + coral island geology = extreme vulnerability |
