Mangroves in India: Significance & Conservation

By Dooit UPSC expert · 15 October 2026 · 12 min read

Mangroves are one of those topics the UPSC examiner returns to again and again — in Prelims as a factual MCQ, in Mains as a climate-and-coast essay. The reason is simple: no other ecosystem does so much with so little attention. Master it once, properly, and you have armour for Environment, Geography and even Disaster Management.

In thirty years of mentoring aspirants, I have watched this single topic decide marks. Candidates who treat mangroves as "some salty coastal trees" lose easy prelims points and write flat, data-free Mains answers. Candidates who understand why mangroves exist, where India's lie, and how the state is now scrambling to save them, write with authority. This guide is the second kind of preparation. Read it slowly, place every fact on the syllabus line it belongs to, and revise it before the exam.

What exactly is a mangrove?

A mangrove is a salt-tolerant tree or shrub that grows in the intertidal zone — the muddy, waterlogged band between the land and the sea where rivers meet the ocean. The word also describes the whole ecosystem: the trees, the tangle of roots, the mud, the crabs and fish, and the birds above. Mangroves are found in sheltered tropical and sub-tropical coasts, deltas and estuaries, where freshwater from rivers mixes with saltwater from the sea to produce the brackish, low-oxygen conditions these plants have mastered.

Think of the mangrove as a frontier species. It lives where almost nothing else can — in soil that is flooded twice a day, starved of oxygen, and saturated with salt that would kill an ordinary tree within days. That it not only survives but builds dense, productive forests is the whole story, and it is built entirely on adaptation.

How mangroves survive: the adaptations examiners love

This section is the heart of any prelims question. Learn these four adaptations cold, because UPSC has repeatedly tested them.

• Pneumatophores (breathing roots): because the soil is waterlogged and anaerobic (oxygen-poor), roots cannot breathe underground. So mangroves send up pencil-like or knee-like roots above the mud that take in air directly through tiny pores. These aerial breathing roots are the single most recognisable feature of a mangrove.
• Stilt or prop roots: the soft, shifting sediment offers no firm anchor, so many mangroves grow arching roots that spread out like stilts, stabilising the tree against tides and storm surges and trapping sediment in the bargain.
• Vivipary: a remarkable reproductive trick. The seed germinates while still attached to the parent tree, developing into a ready seedling before it drops. This gives the young plant a head start in an environment where a loose seed would simply be washed away before it could root.
• Salt regulation: mangroves are halophytes — salt-tolerant plants. Some species exclude salt at the root level, filtering it out before it enters; others excrete excess salt through special glands on their leaves, which is why you can sometimes see salt crystals on mangrove foliage. Thick, waxy leaves further reduce water loss.

If you can explain in one line why each adaptation exists — waterlogging, instability, tidal dispersal, salinity — you will never confuse a mangrove question again.

Mangroves in India: the numbers you must quote

India's mangroves are mapped by the Forest Survey of India in its biennial India State of Forest Report (ISFR). As per the ISFR 2023, India's total mangrove cover is about 4,992 square kilometres, roughly 0.15% of the country's geographical area. It is a tiny fraction of the land, yet it carries ecological weight far beyond its size.

The distribution is heavily skewed toward the east coast, where large deltas provide the ideal sheltered, sediment-rich conditions. Learn the top three in order — this is prime prelims material.

Notice the contrast. West Bengal's dominance comes from one giant, river-fed delta; Gujarat's mangroves are more scattered, often sparse, around the Gulf of Kutch and the Gulf of Khambhat. Odisha, Andhra Pradesh, Maharashtra and Tamil Nadu follow. Remember the pattern rather than every decimal: deltas on the east coast grow the richest mangroves, because that is where big rivers deliver fresh water and silt to a gently sloping shore.

The Sundarbans: the jewel in the crown

No discussion of Indian mangroves is complete without the Sundarbans — the largest contiguous mangrove forest in the world, spread across the delta of the Ganga, Brahmaputra and Meghna rivers and shared between India and Bangladesh. The Indian portion was inscribed as a UNESCO World Heritage Site in 1987, and the Sundarban wetland is a designated Ramsar site of international importance. The forest takes its name, most scholars agree, from the sundari tree (Heritiera fomes), the characteristic mangrove species of the delta.

Its claim to fame in biology is singular: the Sundarbans is the only mangrove ecosystem in the world that is home to the tiger. The Royal Bengal Tiger here has adapted to a semi-aquatic life, swimming between islands and hunting in the tidal creeks. The forest also shelters estuarine (saltwater) crocodiles, Gangetic dolphins, fishing cats, and hundreds of bird species. For UPSC, the Sundarbans is a three-in-one fact: a mangrove, a tiger reserve and biosphere reserve, and a climate-vulnerability case study rolled into one.

It is also a lesson in fragility. Lying barely above sea level, the Sundarbans is among the places most exposed to sea-level rise, cyclones such as Amphan and Yaas, and increasing salinity — which is exactly why it anchors so much of India's new conservation effort.

India's other major mangrove sites

Prelims often tests a specific site, so build a small mental map beyond the Sundarbans:

• Bhitarkanika (Odisha): India's second-largest mangrove forest, in the Brahmani-Baitarani delta, famous for its saltwater crocodiles and as a Ramsar site.
• Coringa (Andhra Pradesh): the second-largest mangrove stretch on the east coast, in the Godavari delta.
• Pichavaram & Muthupettai (Tamil Nadu): well-known for community and backwater mangroves; Point Calimere nearby is a Ramsar wetland.
• Gulf of Kutch (Gujarat): India's first Marine National Park lies here, fringed by arid-zone mangroves.
• Mahanadi and Krishna deltas: smaller but ecologically important east-coast patches.

You do not need to memorise every patch. Anchor the big four — Sundarbans, Bhitarkanika, Coringa, Gulf of Kutch — to their states and rivers, and you will clear almost any map-based or matching question.

Why mangroves matter: ecological and economic value

This is the material that lifts a Mains answer from ordinary to excellent. Mangroves provide a stack of services the economy quietly depends on:

1. Coastal protection — a natural sea wall

The dense root network dissipates wave energy and blunts storm surges. Coastal villages sheltered behind healthy mangroves suffered demonstrably less damage during the 2004 Indian Ocean tsunami and during repeated Bay of Bengal cyclones. In an era of intensifying cyclones, a belt of mangroves is cheaper and more durable than any concrete embankment — a point worth making explicitly in a disaster-management answer.

2. Blue carbon — a climate super-sink

Mangroves are a flagship "blue carbon" ecosystem — the carbon captured by coastal and marine vegetation. They store carbon not only in their wood but, crucially, in the deep, waterlogged, oxygen-starved soils beneath them, where it can remain locked away for centuries. Per hectare, mangroves can sequester several times more carbon than a typical tropical rainforest, which is why they feature so heavily in India's climate commitments.

3. Nurseries of the sea

The sheltered, nutrient-rich waters among mangrove roots are the breeding and nursery grounds for fish, prawns and crabs. A large share of commercial coastal fisheries depends, directly or indirectly, on healthy mangroves — so destroying a mangrove to build a shrimp farm often undermines the very fishery it was meant to boost.

4. Biodiversity and livelihoods

Mangroves support a dense web of life, from tigers and crocodiles to migratory birds, molluscs and bees. For coastal communities they provide honey, fuelwood, fodder and fish — a living economy that collapses when the forest does.

The threats: why mangroves are disappearing

Globally and in India, mangroves have shrunk under sustained pressure. For Mains, group the threats so you can recall them fast:

1. Aquaculture and reclamation: conversion of mangrove land into shrimp and prawn farms, salt pans, and real estate is historically the single biggest driver of loss.
2. Reduced freshwater flow: dams and diversions upstream cut the freshwater and silt reaching the delta, raising salinity to levels even mangroves cannot tolerate.
3. Pollution: industrial effluents, oil spills and plastic waste choke the intertidal zone.
4. Climate change and sea-level rise: rising seas drown low-lying mangroves faster than they can migrate landward, while fiercer cyclones flatten them.
5. Over-extraction: unregulated cutting for fuelwood and fodder thins the forest.

Conservation: what the state is doing

India's policy response has gathered pace, and these are the exact schemes and frameworks examiners expect you to name:

MISHTI (2023)

Mangrove Initiative for Shoreline Habitats & Tangible Incomes (MISHTI) was announced in the Union Budget 2023-24 and is implemented by the Ministry of Environment, Forest and Climate Change in convergence with the states. It targets the restoration and afforestation of mangroves along the coastline and on salt-pan lands over a five-year horizon, with particular attention to the Sundarbans. The scheme's name captures its philosophy: protect the shoreline and create tangible livelihoods for coastal communities, so that conservation pays for itself.

Mangrove Alliance for Climate

Launched at the COP27 climate conference in 2022, the Mangrove Alliance for Climate is an intergovernmental effort to scale up mangrove restoration worldwide. India is a member, and MISHTI is, in effect, the domestic expression of that commitment.

Coastal Regulation Zone (CRZ)

Under the Coastal Regulation Zone notification, dense mangroves are treated as ecologically sensitive and placed in the most protected zone, where construction and development are sharply restricted. This legal shield is often the difference between a mangrove belt surviving or being paved over.

Ramsar and wetland protection

Several of India's finest mangroves — the Sundarban, Bhitarkanika, Point Calimere and Coringa among them — are designated Ramsar sites of international importance, which brings them under focused wetland conservation and monitoring. If you are still shaky on the Ramsar framework, read our companion guide on wetlands and Ramsar sites in India alongside this one.

How to study mangroves for UPSC

Let me close with the practical angle, because knowing a topic and scoring on it are different skills.

For Prelims, drill the factual spine: the four adaptations and the problem each solves; the top three states; the Sundarbans facts (world's largest, UNESCO 1987, Ramsar, only tiger mangrove, sundari tree); and the names MISHTI, Mangrove Alliance for Climate, and CRZ. These are the exact hooks on which objective questions hang.

For Mains, hold a ready structure: significance (coastal shield, blue carbon, fisheries, biodiversity) → threats (aquaculture, reduced flow, pollution, climate) → response (MISHTI, CRZ, Ramsar, community participation) → a forward-looking conclusion on balancing coastal development with ecological security. Garnish with one or two precise figures — the 4,992 sq km cover, the 0.15% share — and your answer instantly reads like it was written by someone who knows the subject, not someone paraphrasing a textbook.

Above all, connect mangroves to the news. Every cyclone in the Bay of Bengal, every debate over a coastal port or a shrimp-farm expansion, every climate summit is a chance to deploy this topic. That habit of linking the static to the dynamic is the single most valuable skill this exam rewards — and it is exactly what a structured, AI-guided revision system is built to train.