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UNESCO WORLD HERITAGE SITE (1987)

SUNDARBANS

সুন্দরবন - सुंदरबन

"The Beautiful Forest"

The World's Largest Mangrove Forest — Home to the legendary swimming Royal Bengal Tigers, the mystical Sundarbans is where the Ganga-Brahmaputra delta meets the Bay of Bengal, creating one of Earth's most unique and biodiverse ecosystems.
9,630 km² Total Area
96 Tigers (2020)
102 Islands
34 Mangrove Species
300+ Bird Species
400+ Fish Species
1987 UNESCO Listed
4.5M Population

Overview

The Majestic Tidal Forest of the Ganges Delta

Location

  • Region: Ganga-Brahmaputra-Meghna Delta
  • Countries: India (40%), Bangladesh (60%)
  • Indian State: West Bengal
  • Districts: North 24 Parganas, South 24 Parganas
  • Coordinates: 21°32'N to 22°40'N, 88°05'E to 89°51'E

Extent (Indian Sundarbans)

  • Total Area: 9,630 km²
  • Land Area: 4,200 km²
  • Water Area: 5,430 km²
  • Mangrove Forest: 2,125 km²
  • Total Islands: 102 (54 inhabited, 48 reserved)

Formation

  • Type: Deltaic deposit (Ganga-Brahmaputra)
  • Age: Quaternary period (2.6 million years)
  • Process: Continuous sediment deposition
  • Status: Still evolving delta
  • Dynamics: River channels constantly shifting

Etymology

  • Origin 1: "Sundari" trees (Heritiera fomes) - dominant species
  • Origin 2: "Samudra ban" (Ocean forest)
  • Bengali: সুন্দরবন (Shundorbôn)
  • Hindi: सुंदरबन
  • Meaning: "Beautiful Forest"

Quick Facts

#1
Largest Mangrove (World)
ONLY
Mangrove Tiger Habitat
2,487
Species Documented
19
CD Blocks
3-7m
Tidal Range
1973
Project Tiger Site

Interactive Map of Sundarbans

Explore the rivers, islands, protected areas, and key locations

Sundarbans National Park (Core Zone)
Wildlife Sanctuaries
Major Rivers & Channels
Tourist Entry Points
Watch Towers
Major Islands

Geography & Climate

The Dynamic Delta Landscape

Tidal Dynamics

  • Type: Semi-diurnal (twice daily)
  • Normal Range: 3-5 meters
  • Spring Tide: Up to 7 meters
  • Inland Influence: Up to 300 km
  • Water Type: Brackish (saline-freshwater mix)
  • Current: Strong tidal currents shape landscape

Soil & Geology

  • Soil Type: Saline alluvial clay
  • Origin: Himalayan sediments
  • Depth: Several hundred meters
  • Formation: Continuous deposition
  • Stability: Dynamic, constantly changing
  • Islands: Low-lying mud islands

Climate

Type: Tropical Monsoon (Am) - Hot and humid throughout the year

20-35°C
Temperature Range
1,600-1,800mm
Annual Rainfall
70-80%
Humidity
June-Sept
Monsoon Season
Frequent
Cyclones

Major Cyclones: Sidr (2007), Aila (2009), Amphan (2020) - Sundarbans acts as natural cyclone barrier protecting millions.

Rivers & Waterways

A labyrinth of 100+ interconnected tidal channels

Major Rivers

Hooghly (Bhagirathi)

Western boundary

Raimangal

India-Bangladesh border

Matla

Central channel

Bidyadhari

Major distributary

Thakuran

Southern region

Gosaba

Eastern section

Harinbhanga

Border river

Channel Characteristics

Number: 100+ flowing channels

Network: Interconnected waterways

Water: Brackish (saline mix)

Tidal: All channels tidal

Transport: Only mode of travel

Fishing: Primary livelihood

Major Islands (Indian Side)

Gosaba
Basanti
Kultali
Patharpratima
Sandeshkhali
Hingalganj
Sagar Island Gangasagar Mela

Mangrove Ecosystem

34 Mangrove Species - World's Largest Halophytic Forest

Dominant Mangrove Species

Sundari

Heritiera fomes

The namesake species - gives Sundarbans its name. Most valuable timber tree. Declining due to salinity increase.

Gewa

Excoecaria agallocha

Common species. Produces blinding latex sap. Used for matchsticks and newsprint.

Goran

Ceriops decandra

Tannin-rich bark used for tanning and dyeing. Important for mangrove zonation.

Keora

Sonneratia apetala

Pioneer species on mudflats. Fruit edible. Important for coastal stabilization.

Dhundul

Xylocarpus granatum

Cannonball tree. Seeds float and disperse by water. Beautiful buttress roots.

Passur

Xylocarpus mekongensis

Valuable timber. Found in less saline areas. Endangered due to over-exploitation.

Khalsi

Aegiceras corniculatum

River mangrove. Important honey plant for Sundarbans honey production.

Hental Palm

Nypa fruticans

Only palm in mangroves. Leaves used for thatching (Golpata). Sugar extracted from sap.

Mangrove Adaptations

Pneumatophores

Breathing roots that project above water/mud surface to absorb oxygen in waterlogged soil.

Viviparous Germination

Seeds germinate while still attached to parent tree, forming propagules that float and establish quickly.

Salt Filtration

Roots filter out salt; some species excrete salt through special glands in leaves.

Prop/Stilt Roots

Above-ground roots provide stability in soft mud and support against tidal forces and waves.

Vegetation Zones

1. Seaward Fringe

Species: Sonneratia, Avicennia

Wave action tolerant, pioneer zone

2. Middle Zone

Species: Rhizophora, Bruguiera

Dense growth, maximum biodiversity

3. Landward Zone

Species: Heritiera, Xylocarpus

Less saline, tallest trees

Wildlife of Sundarbans

Home to Unique Swimming Tigers and Diverse Mangrove Fauna

Royal Bengal Tiger

Panthera tigris tigris

UNIQUE SWIMMING POPULATION

Population: 96 (2020 census, Indian side)

Unique Behavior: Swims between islands (up to 8 km)

Significance: Largest mangrove tiger population in world

Man-eater: Known attacks on honey collectors and fishermen

Adaptation: Drinks saline water, hunts in tidal channels

Saltwater Crocodile

Crocodylus porosus

ENDANGERED

Population: 200+ (estimated)

Size: Largest living reptile (up to 7m)

Habitat: Tidal rivers and estuaries

Diet: Fish, crabs, mammals, birds

Threat: Human conflict, habitat loss

Gangetic River Dolphin

Platanista gangetica

ENDANGERED

Habitat: Freshwater zones of rivers

Status: National Aquatic Animal

Feature: Functionally blind, uses echolocation

Threats: Pollution, fishing nets, dams

Fishing Cat

Prionailurus viverrinus

VULNERABLE

Specialty: Mangrove specialist

Behavior: Excellent swimmer and fisher

Habitat: Wetlands, mangroves

Diet: Fish, crabs, snakes, birds

Conservation: State animal of West Bengal

Spotted Deer (Chital)

Axis axis

ABUNDANT

Population: Most abundant ungulate

Role: Primary prey for tigers

Habitat: Forest edges, grasslands

Behavior: Herds on beaches at low tide

Smooth-coated Otter

Lutrogale perspicillata

VULNERABLE

Habitat: Rivers, channels, creeks

Behavior: Lives in family groups

Diet: Fish specialist

Local Use: Traditional fishing with trained otters

Birds (300+ Species)

Resident Species

Lesser Adjutant Stork
Asian Openbill Stork
Black-capped Kingfisher
Mangrove Whistler
Mangrove Pitta
White-bellied Sea Eagle
Brown-winged Kingfisher (Endemic)

Migratory Species

Curlews
Sandpipers
Plovers
Siberian Ducks
Gulls & Terns

Reptiles

Saltwater Crocodile
Water Monitor Lizard
King Cobra
Banded Krait
Russell's Viper
Mangrove Pit Viper
Dog-faced Water Snake

Sea Turtles

Olive Ridley
Green Sea Turtle
Hawksbill
River Terrapin (Critically Endangered)

Aquatic Life (400+ Fish Species)

Major Fish Species

  • Hilsa (Tenualosa ilisha) - Anadromous
  • Bhetki (Barramundi)
  • Parshe
  • Mud Skippers (amphibious)
  • Sharks & Rays (coastal)

Crustaceans

  • Tiger Prawn (commercial)
  • Mud Crabs
  • Fiddler Crabs
  • Horseshoe Crabs (living fossil)

Molluscs

  • Oysters
  • Clams
  • Mussels

Protected Areas

Multi-layered Protection for the World's Largest Mangrove

Sundarbans National Park

1,330 km²
  • Established: 1984
  • UNESCO World Heritage: 1987
  • Core Area (No habitation)
  • Highest protection level

Sundarbans Tiger Reserve

2,585 km²
  • Established: 1973 (Project Tiger)
  • Includes National Park + Buffer
  • 96 Tigers (2020 census)
  • One of original 9 tiger reserves

Sundarbans West WLS

556 km²
  • Wildlife Sanctuary
  • Buffer zone protection

Sundarbans South WLS

1,026 km²
  • Wildlife Sanctuary
  • Largest sanctuary in region

Sundarbans East WLS

335 km²
  • Wildlife Sanctuary
  • Near Bangladesh border

Ramsar Wetland

3,69,000 ha
  • Wetland of International Importance
  • Recognized for biodiversity value

Threats to Sundarbans

Facing Multiple Challenges from Climate Change and Human Activities

Natural Threats

  • Cyclones: Frequent and devastating (Sidr, Aila, Amphan)
  • Sea Level Rise: 3.14 mm/year increase
  • Island Submergence: Lohachara disappeared (2006)
  • Coastal Erosion: 28 islands lost or eroding
  • Salinity Intrusion: Increasing salt concentration
  • Tiger Attacks: 60-100 human deaths annually

Anthropogenic Threats

  • Upstream Pollution: Industrial and domestic waste
  • Overfishing: Depleting fish stocks
  • Shrimp Farming: Destroying mangrove areas
  • Encroachment: Illegal settlement expansion
  • Farakka Barrage: Reduced freshwater flow
  • Tourism Pressure: Disturbance to wildlife

Climate Change Impact

  • Rising Temperatures: Affecting ecosystem balance
  • Changing Rainfall: Altered monsoon patterns
  • Sundari Decline: Namesake tree dying
  • Tiger Habitat: Shrinking due to submergence
  • Increased Conflict: Human-wildlife encounters
  • Extreme Events: More frequent cyclones

Conservation Efforts

Multi-pronged Approach to Protect this Unique Ecosystem

Project Tiger (1973)

One of the original 9 tiger reserves. Focus on tiger habitat protection and population monitoring.

UNESCO Recognition (1987)

World Heritage Site status bringing international attention and conservation support.

Ramsar Site (2019)

Recognized as Wetland of International Importance under Ramsar Convention.

Tiger Attack Prevention

Wire mesh masks worn backward, electrified dummies, and training for honey collectors.

Community Participation

Joint Forest Management, Eco-development Committees, and sustainable livelihood programs.

Tiger Widows Support

Rehabilitation and support programs for families affected by tiger attacks.

Eco-tourism Regulation

Controlled tourism with permits, restricted zones, and timing limitations.

Alternative Livelihoods

Programs to reduce forest dependence through skill development and alternative income sources.

Ecosystem Services

Natural Benefits Worth Billions to Human Society

Carbon Sequestration

Mangroves store 4x more carbon than terrestrial forests. Major "blue carbon" sink combating climate change.

Storm Protection

Natural barrier against cyclones, protecting millions of lives. Reduces wave height and storm surge damage.

Fishery Nursery

Breeding ground for commercial fish species. Supports livelihoods of 4.5 million people.

Water Filtration

Sediment trapping and pollution reduction. Natural water purification system.

Biodiversity Reservoir

Home to 2,487 documented species. Genetic resource for future research and medicine.

Tourism Information

Experience the Magic of the World's Largest Mangrove Forest

Entry Points

Sajnekhali

Main entry point with interpretation center

Dobanki

Canopy walk and watchtower

Sudhanyakhali

Tiger sighting watchtower

Netidhopani

Temple ruins and watchtower

Attractions

Tiger Sighting

Boat safaris for tiger viewing

Mangrove Trails

Guided walks through mangroves

Watchtowers

Wildlife observation points

Crocodile Spotting

Saltwater crocodile sighting

Bird Watching

300+ species to spot

Village Tourism

Local community experience

Visitor Information

Regulations

  • Permit required
  • Restricted zones enforced
  • Boat safaris only (no land entry in core)
  • Timing restrictions apply

Facilities

  • Eco-cottages available
  • Watch towers
  • Interpretation centers
  • Boat rental services

Accessibility

  • Kolkata to Canning: 48 km
  • Rail: Canning station
  • Boat: Only mode inside
  • Best season: Nov-Feb

Culture & Mythology

Where Faith, Nature, and Survival Intertwine

Local Deities

Bonbibi (Forest Goddess)

Protector of the forest and its people. Worshipped before entering the forest. Believed to protect from tiger attacks.

Dakshin Ray (Tiger God)

The tiger deity representing the danger and power of the forest. Balance between fear and reverence.

Festivals

Gangasagar Mela

Annual pilgrimage at Sagar Island where Ganga meets the sea. Thousands gather on Makar Sankranti.

Bonbibi Puja

Celebration honoring the forest goddess. Performed before forest expeditions and during annual festivals.

Folklore

  • Tiger lore and legends
  • River spirits and water deities
  • Fisher folk oral traditions
  • Songs of Mouli (honey collectors)
  • Tales of survival and coexistence

Human Population

54
Inhabited Islands
4.5M
Population (approx.)
19
CD Blocks
70%
Fishing Occupation

Occupations

Fishing (primary)
Agriculture (rice)
Honey Collection (Mouli)
Crab Collection
Tourism

Forest Produce

Sundarbans Honey (famous)
Beeswax
Fish & Crabs
Golpata (thatching)
Timber (regulated)

Unique Features

What Makes Sundarbans Unparalleled in the World

World's Largest Mangrove

The biggest continuous mangrove forest on Earth, spanning India and Bangladesh.

Only Mangrove Tiger Habitat

The only place where tigers live in mangrove ecosystem and have adapted to swim.

Swimming Tigers

Tigers here swim between islands, covering distances up to 8 km in tidal waters.

Largest Tidal Forest

Entire ecosystem shaped by semi-diurnal tides with 3-7 meter tidal range.

Most Dynamic Delta

Still evolving delta with continuous sediment deposition and island formation.

Unique Honey

Sundarbans honey has distinctive taste from mangrove flowers, collected by Mouli tradition.