An alarming 20 percent of mangrove forest area has been destroyed since 1980
Food & Agriculture Organization
(Rome February 8, 2008) Environmental and economic damages caused by the alarming loss of mangroves in many countries should be urgently addressed, the United Nations Food and Agriculture Organization said this week, calling for better mangrove protection and management programs.
The world has lost around 3.6 million hectares (ha) of mangroves since 1980, equivalent to an alarming 20 percent loss of total mangrove area according to FAOÂ’s recent mangrove assessment study, entitled The worldÂ’s mangroves 1980-2005.
The total mangrove area has declined from 18.8 million ha in 1980 to 15.2 million ha in 2005, according to the report. There has, however, been a slowdown in the rate of mangrove loss: from some 187 000 ha destroyed annually in the 1980s to 102 000 ha a year between 2000 and 2005, reflecting an increased awareness of the value of mangrove ecosystems. World's largest mangrove forest in Bangladesh Sundarbans mangrove forest has substantial ecological and economic importance at local, national and global scales. Over the past decades,
invasive species have spread significantly in the mangrove ecosystem. We conducted a study to identify the different types of invasive speciespresent, the rate and pattern of invasion, its intensity, association of invaders and their habitat preference in the Sundarbans mangrove ecosystem.
Vegetation was sampled in 250 quadrats, each 10 m 10 m, and 125 line transects each 100 m 20 m; through a combination of random and
systematic sampling. Altogether 23 plant species of two broad types’ viz. aquatic weed and climbers were identified as invasive. Of the identified 23
invasive species, 19 are native or naturalized to Sundarbans mangrove. Invasives’ abundance, diversity and rate of invasion (RI) were highest at the
riverbanks and gradually decreased with increased proximity to the forests. Based on the severity of damage, species were classified as highly
invasive, invasive and potentially invasive. Our study suggests that invasion in Sundarbans are still at a controllable stage. Continuous monitoring,
Etymology
History
The history of the area can be traced back to 200–300 AD. A ruin of a city built by Chand Sadagar has been found in the Baghmara Forest Block. During the Mughal period, the Mughal Kings leased the forests of the Sundarbans to nearby residents. Many criminals took refuge in the Sundarbans from the advancing armies of Emperor Akbar. Many have been known to be attacked by Tigers[2] Many of the buildings which were built by them later fell to hands of Portuguese pirates, salt smugglers and dacoits in the 17th century. Evidence of the fact can be traced from the ruins at Netidhopani and other places scattered all over Sundarbans.[3] The legal status of the forests underwent a series of changes, including the distinction of being the firstmangrove forest in the world to be brought under scientific management. The area was mapped first in Persian, by the Surveyor Generalas early as 1764 following soon after proprietary rights were confiscated from the Mughal Emperor Alamgir II by the British East India Company in 1757. As the British had no expertise or adaptation experience in mangrove forests. Systematic management of this forest tract started in the 1860s after the establishment of a Forest Department in the Province of Bengal, in British India. The management was entirely designed to extract whatever treasures were available, but labor and lower management mostly were staffed by locals[4]
The first Forest Management Division to have jurisdiction over the Sundarbans was established in 1869. In 1875 a large portion of themangrove forests was declared as reserved forests in 1875–76 under the Forest Act, 1865 (Act VIII of 1865). The remaining portions of the forests were declared a reserve forest the following year and the forest, which was so far administered by the civil administration district, was placed under the control of the Forest Department. A Forest Division, which is the basic forest management and administration unit, was created in 1879 with the headquarter in Khulna, Bangladesh. The first management plan was written for the period 1893–98.[5][6]
In 1911, it was described as a tract of waste country which had never been surveyed, nor had the census been extended to it. It then stretched for about 165 miles (266 km) from the mouth of the Hugli to the mouth of the Meghna river and was bordered inland by the three settled districts of the 24 Parganas, Khulna and Bakerganj. The total area (including water) was estimated at 6,526 square miles (16,902 km2). It was a water-logged jungle, in which tigers and other wild beasts abounded. Attempts at reclamation had not been very successful. The Sundarbans was everywhere intersected by river channels and creeks, some of which afforded water communication throughout the Bengal region both for steamers and for native boats. Physiography
The mangrove-dominated Ganges Delta – the Sundarbans – is a complex ecosystem comprising one of the three largest single tracts of mangrove forests of the world. Situated mostly in Bangladesh, a small portion of it lies in India. The Indian part of the forest is estimated to be about 19%, while the Bangladeshi part is 81%. To the south the forest meets the Bay of Bengal; to the east it is bordered by the Baleswar Riverand to the north there is a sharp interface with intensively cultivated land. The natural drainage in the upstream areas, other than the main river channels, is everywhere impeded by extensive embankments andpolders. The Sundarbans was originally measured (about 200 years ago) to be of about 16,700 km². Now it has dwindled into about 1/3 of the original size. The total land area today is 4,143 km² (including exposed sandbars: 42 km²) and the remaining water area of 1,874 km² encompasses rivers, small streams and canals. Rivers in the Sundarbans are meeting places of salt water and freshwater. Thus, it is a region of transition between the freshwater of the rivers originating from the Ganges and the saline water of the Bay of Bengal (Wahid et al., 2002).
The Sundarbans along the Bay of Bengal has evolved over the millennia through natural deposition of upstream sediments accompanied by intertidal segregation. The physiography is dominated by deltaic formations that include innumerable drainage lines associated with surface and subaqueous levees, splays and tidal flats. There are also marginal marshes above mean tide level, tidal sandbars and islands with their networks of tidal channels, subaqueous distal bars and proto-delta clays and silt sediments. The Sundarbans' floor varies from 0.9 m to 2.11 m above sea level.[8]
Biotic factors here play a significant role in physical coastal evolution, and for wildlife a variety of habitats have developed which include beaches, estuaries, permanent and semi-permanent swamps, tidal flats, tidal creeks, coastal dunes, back dunes and levees. The mangrove vegetation itself assists in the formation of new landmass and the intertidal vegetation plays a significant role in swamp morphology. The activities of mangrove fauna in the intertidal mudflats develop micromorphological features that trap and hold sediments to create a substratum for mangrove seeds. The morphology and evolution of the eolian dunes is controlled by an abundance ofxerophytic and halophytic plants. Creepers, grasses and sedges stabilize sand dunes and uncompacted sediments. The Sunderbans mudflats (Banerjee, 1998) are found at the estuary and on the deltaic islands where low velocity of river and tidal current occurs. The flats are exposed in low tides and submerged in high tides, thus being changed morphologically even in one tidal cycle. The interior parts of the mudflats are magnificent home of luxuriant mangroves.
Ecoregions
Sundarbans features two ecoregions — "Sundarbans freshwater swamp forests" (IM0162) and "Sundarbans mangroves" (IM1406).[9]
[edit]Sundarbans freshwater swamp forests
The Sundarbans freshwater swamp forests are a tropical moist broadleaf forest ecoregion of Bangladesh. It represents the brackish swamp forests that lie behind the Sundarbans Mangroves, where the salinity is more pronounced. The freshwater ecoregion is an area where the water is only slightly brackish and becomes quite fresh during the rainy season, when the freshwater plumes from the Ganges and the Brahmaputra rivers push the intruding salt water out and bring a deposit of silt. It covers an area of 14,600 square kilometers (5,600 sq mi) of the vast Ganges-Brahmaputra Delta, extending from the northern part of Khulna District and finishing at the mouth of the Bay of Bengal with scattered portions extending into India's West Bengal state. The Sundarbans freshwater swamp forests lie between the upland Lower Gangetic plains moist deciduous forests and the brackish-water Sundarbans mangroves bordering the Bay of Bengal.[10]
A victim of large-scale clearing and settlement to support one of the densest human populations in Asia, this ecoregion is under a great threat of extinction. Hundreds of years of habitation and exploitation have exacted a heavy toll on this ecoregion's habitat and biodiversity. There are two protected areas — Narendrapur (110 km2) and Ata Danga Baor (20 km2) that cover a mere 130 km2 of the ecoregion. Habitat loss in this ecoregion is so extensive, and the remaining habitat is so fragmented, that it is difficult to ascertain the composition of the original vegetation of this ecoregion. According to Champion and Seth (1968), the freshwater swamp forests are characterized by Heritiera minor, Xylocarpus molluccensis, Bruguiera conjugata, Sonneratia apetala, Avicennia officinalis, andSonneratia caseolaris, with Pandanus tectorius, Hibiscus tiliaceus, and Nipa fruticans along the fringing banks.[10]
[edit]Sundarbans Mangroves
The Sundarbans Mangroves ecoregion on the coast forms the seaward fringe of the delta and is the world's largest mangroveecosystem, with 20,400 square kilometers (7,900 sq mi) of area covered. The dominant mangrove species Heritiera fomes is locally known as sundri or sundari. Mangrove forests are not home to a great variety of plants. They have a thick canopy, and the undergrowth is mostly seedlings of the mangrove trees. Besides the sundari, other species that make up the forest include Avicennia spp.,Xylocarpus mekongensis, Xylocarpus granatum, Sonneratia apetala, Bruguiera gymnorrhiza, Cereops decandra, Aegiceras corniculatum, Rhizophora mucronata, and Nypa fruticans palms.[11]
[edit]Climate change impact
The physical development processes along the coast are influenced by a multitude of factors, comprising wave motions, micro and macro-tidal cycles and long shore currents typical to the coastal tract. The shore currents vary greatly along with the monsoon. These are also affected by cyclonic action. Erosion and accretion through these forces maintains varying levels, as yet not properly measured, of physiographic change whilst the mangrove vegetation itself provides a remarkable stability to the entire system. During each monsoon season almost all the Bengal Delta is submerged, much of it for half a year. The sediment of the lower delta plain is primarily advected inland by monsoonal coastal setup and cyclonic events. One of the greatest challenges people living on the Ganges Delta may face in coming years is the threat of rising sea levels caused mostly by subsidence in the region and partly by climate change.
In many of the Bangladesh's mangrove wetlands, freshwater reaching the mangroves was considerably reduced from the 1970s due to diversion of freshwater in the upstream area by neighboring India through the use of the Farakka Barrage bordering Rajshahi,Bangladesh. Also, the Bengal Basin is slowly tilting towards the east due to neo-tectonic movement, forcing greater freshwater input to the Bangladesh Sundarbans. As a result, the salinity of the Bangladesh Sundarbans is much lower than that of the Indian side. A 1990 study noted that there "is no evidence that environmental degradation in the Himalayas or a 'greenhouse' induced rise in sea level have aggravated floods in Bangladesh"; however, a 2007 report by UNESCO, "Case Studies on Climate Change and World Heritage" has stated that an anthropogenic 45-cm rise in sea level (likely by the end of the 21st century, according to the Intergovernmental Panel on Climate Change), combined with other forms of anthropogenic stress on the Sundarbans, could lead to the destruction of 75% of the Sundarbans mangroves.[12] Already, Lohachara Island and New Moore Island/South Talpatti Island have disappeared under the sea, andGhoramara Island is half submerged.[13]
[edit]Flora
A total 245 genera and 334 plant species were recorded byDavid Prain in 1903.[14] While most of the mangroves in other parts of the world are characterized by members of the Rhizophoraceae, Avicenneaceae or Laganculariaceae, the mangroves of Bangladesh are dominated by the Sterculiaceae and Euphorbiaceae.[5] Dominant flora includes:
The Sundarbans flora is characterized by the abundance of sundari (Heritiera fomes), gewa (Excoecaria agallocha), goran (Ceriops decandra) and keora (Sonneratia apetala) all of which occur occur prominently throughout the area. The characteristic tree of the forest is the sundari (Heritiera littoralis), from which the name of the forest had probably been derived. It yields a hard wood, used for building houses and making boats, furniture and other things. New forest accretions is often conspicuously dominated by keora (Sonneratia apetala) and tidal forests. It is an indicator species for newly accreted mudbanks and is an important species for wildlife, especially spotted deer (Axis axis). There is abundance of dhundul or passur (Xylocarpus granatum) and kankra (Bruguiera gymnorrhiza) though distribution is discontinuous. Among palms, Poresia coaractata and Myriostachya wightiana, and among grasses spear grass (Imperata cylindrica), khagra (Phragmites karka) and golpata (Nypa fruticans) are well distributed.
The varieties of the forests that exist in Sunderbans include mangrove scrub, littoral forest, saltwater mixed forest, brackish water mixed forest and swamp forest. Besides the forest, there are extensive areas of brackish water and freshwater marshes, intertidal mudflats,sandflats, sand dunes with typical dune vegetation, open grassland on sandy soils and raised areas supporting a variety of terrestrial shrubs and trees. Since Prain’s report there have been considerable changes in the status of various mangrove species and taxonomic revision of the man-grove flora.[15] However, very little exploration of the botanical nature of the Sundarbans has been made to keep up with these changes. Differences in vegetation have been explained in terms of freshwater and low salinity influences in the Northeast and variations in drainage and siltation. The Sundarbans has been classified as a moist tropical forest demonstrating a whole mosaic ofseres, comprising primary colonization on new accretions to more mature beach forests. Historically vegetation types have been recognized in broad correlation with varying degrees of water salinity, freshwater flushing and physiography.
[edit]Mangrove
See also: Mangrove
Twenty-six of the fifty broad mangrove types found in the world grow well in the Sundarbans. The commonly identifiable vegetation that grow in the dense mangrove forests at the Sundarbans are salt water mixed forest, mangrove scrub, brackish water mixed forest, littoral forest, wet forest and wet alluvial grass forests. The Bangladesh mangrove vegetation of the Sundarbans differs greatly from other non-deltaic coastal mangrove forests and upland forests associations. Unlike the former, the Rhizophoraceae are of minor importance.
[edit]Ecological succession
Ecological succession is generally defined as the successive occupation of a site by different plant communities.[16] In an accreting mudflats the outer community along the sequence represents the pioneer community which is gradually replaced by the next community representing the seral stages and finally by a climax community typical of the climatic zone.[17] Troup suggested that succession began in the newly accreted land created by fresh deposits of eroded soil.[18] The pioneer vegetation on these newly accreted sites is Sonneratia, followed by Avicennia and Nypa. As the ground is elevated as a result of soil deposition, other trees make their appearance. The most prevalent, though one of the late species to appear, is Excoecaria. As the level of land rises through accretion and the land is only occasionally flooded by tides, Heritiera fomes begins to appear.
[edit]Fauna
See also: Tiger attacks in the Sundarbans
The Sundarbans provides a unique ecosystem and a rich wildlife habitat. According to the 2011 tiger census, the Sundarbans have about 270 tigers. Although previous rough estimates had suggested much higher figures close to 300, the 2011 census provided the first ever scientific estimate of tigers from the area[19][20] Tiger attacks are frequent in the Sundarbans. Between 100 and 250 people are killed per year.
There is much more wildlife here than just the endangeredRoyal Bengal Tiger (Panthera tigris tigris). Most importantly, mangroves are a transition from the marine to freshwater and terrestrial systems, and provide critical habitat for numerous species of small fish, crabs, shrimps and other crustaceans that adapt to feed and shelter, and reproduce among the tangled mass of roots, known as pneumatophores, which grow upward from the anaerobic mud to get the supply of oxygen. Fishing Cats, Macaques, wild boars, Common Grey Mongooses, Foxes, Jungle Cats, Flying Foxes, Pangolins, and spotted deer are also found in abundance in the Sundarbans.
A 1991 study has revealed that the Bangladeshi part of the Sundarbans supports diverse biological resources including at least 150 species of commercially important fishes, 270 species of birds, 42 species of mammals, 35 reptiles and 8 amphibian species. This represents a significant proportion of the species present in Bangladesh (i.e. about 30% of the reptiles, 37% the birds and 34% of the mammals) and includes a large number of species which are now extinct elsewhere in the country.[21] Two amphibians, 14 reptiles, 25 aves and five mammals are presently endangered.[22] The Sundarbans is an important wintering area for migrant water birds[23] and is an area suitable for watching and studying avifauna.[24]
The management of wildlife is presently restricted to, firstly, the protection of fauna from poaching, and, secondly, designation of some areas as wildlife sanctuaries where no extraction of forest produce is allowed and where the wildlife face few disturbances. Although the fauna of Bangladesh have diminished in recent times[5] and the Sundarbans has not been spared from this decline, the mangrove forest retains several good wildlife habitats and their associated fauna. Of these, the tiger and dolphin are target species for planning wildlife management and tourism development. There are high profile and vulnerable mammals living in two contrasting environments, and their statuses and management are strong indicators of the general condition and management of wildlife. Some of the species are protected by legislation, notably by the Bangladesh Wildlife (Preservation) Order, 1973 (P.O. 23 of 1973).[25]
[edit]Predators
See also: Tiger attacks in the Sundarbans
The fertile soils of the delta have been subject to intensive human use for centuries, and the ecoregion has been mostly converted to intensive agriculture, with few enclaves of forest remaining. The remaining forests, together with the Sundarbans mangroves, are important habitats for the endangered Bengal Tiger (Panthera tigris). The forest also contains leopard (Panthera pardus fusca) and several other smaller predators such as the jungle cats (Felis chaus), fishing cats (Prionailurus viverrinus), and leopard cats (Prionailurus bengalensis).[10]
Several predators dwell in the labyrinth of channels, branches and roots that poke up into the air. This is the only mangrove ecoregion that harbors the Indo-Pacific region's largest predator, the Bengal Tiger. Unlike in other habitats, tigers live here and swim among the mangrove islands, where they hunt scarce prey such as the Chital deer (axis axis), Indian Muntjacs(Muntiacus muntjak), Wild boars (Sus scrofa), and even Rhesus Macaque (Macaca mulatta). It is estimated that there are now 500[20] Bengal tigers and about 30,000 spotted deer in the area. The tigers regularly attack and kill humans who venture into the forest, human deaths ranging from 30–100 per year.[26]
Some of the reptiles are predators too, including two species of crocodiles, the Saltwater Crocodile (Crocodylus porosus) and Mugger crocodile (Crocodylus palustris), as well as the Gharial (Gavialis gangeticus) and the Water monitor lizards (Varanus salvator), all of which hunt on both land and water. Sharks and the Gangetic dolphins (Platanista gangetica) roam the waterways.[27]
[edit]Avifauna
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The forest is also rich in bird life, with 170 species including the endemic Brown-winged Kingfishers (Pelargopsis amauroptera) and the globally threatened Lesser Adjutants(Leptoptilos javanicus) and Masked Finfoots (Heliopais personata) and birds of prey such as the ospreys (Pandion haliaetus), White-bellied Sea Eagles (Haliaeetus leucogaster)and Grey-headed Fish-eagles (Ichthyophaga ichthyaetus). The Sundarbans was designated a Ramsar site on May 21, 1992.[28] Some of the more popular birds found in this region are Open Billed Storks, Black-headed Ibis, Water Hens,Coots, Pheasant-tailed Jacanas, Pariah Kites, Brahminy Kites, Marsh Harriers, Swamp Partridges, Red Junglefowls,Spotted Doves, Common Mynahs, Jungle Crows, Jungle Babblers, Cotton Teals, Herring Gulls, Caspian Terns, Gray Herons, Brahminy Ducks, Spot-billed Pelicans, great Egrets, Night Herons, Common Snipes, Wood Sandpipers, Green Pigeons, Rose Ringed Parakeets,Paradise Flycatchers, Cormorants, Fishing Eagles, White-bellied Sea Eagles, Seagulls, Common Kingfishers, Peregrine falcons,Woodpeckers, Whimprels, Black-tailed Godwits, Little Stints, Eastern Knots, Curlews, Golden Plovers, Pintails, White Eyed Pochardsand Whistling Teals.
[edit]Aqua fauna
Some of the fish and amphibians found in the Sunderbans aresawfish, butter Fish, electric ray, common carp, silver carp,barb, river Eels, starfish, king crab, fiddler crab, hermit crab,prawn, shrimps, Gangetic dolphins, skipping frogs, common toads and tree Frogs. One particularly interesting fish is themudskipper, a gobioid that climbs out of the water into mudflats and even climbs trees.
[edit]Reptiles
The Sundarbans National Park houses an excellent number of reptiles as well. Some of the common ones are Olive Ridley turtles, sea snakes, Dog Faced Water Snakes, Green Turtles,Estuarine Crocodiles, Chameleons, King Cobras, Salvator Lizards, Hard Shelled Batgun Terrapins, Russels Vipers, Mouse Ghekos,Monitor Lizards, Curviers, Hawks Bill Turtles, Pythons, Common Kraits, Chequered Killbacks and rat Snakes. The river terrapin (Batagur baska), Indian flap-shelled turtles (Lissemys punctata), peacock soft-shelled turtles (Trionyx hurum), yellow monitors (Varanus flavescens), water monitors (Varanus salvator), and Indian pythons (Python molurus) are some of the resident species.
[edit]Endangered and extinct species
Forest inventories reveal a decline in standing volume of the two main commercial mangrove species — sundari (Heritiera spp.) and gewa (Excoecaria agallocha) — by 40% and 45% respectively between 1959 and 1983 (Forestal 1960 and ODA 1985). Despite a total ban on all killing or capture of wildlife other than fish and some invertebrates, it appears that there is a consistent pattern of depleted biodiversity or loss of species (notably at least six mammals and one important reptile) in this century, and that the "ecological quality of the original mangrove forest is declining" (IUCN 1994).
The endangered species that live within the Sundarbans and extinct species that used to be include the Royal Bengal Tigers, Estuarine Crocodile, Northern river terrapins (Batagur baska), Olive Ridley Turtles, Gangetic dolphin, Ground Turtles, Hawks Bill Turtles and King Crabs (Horse shoe). Some species such as hog deer (Axis porcinus), water buffalos (Bubalus bubalis), Barasingha or swamp deer (Cervus duvauceli), Javan rhinoceros (Rhinoceros sondaicus), single horned rhinoceros (Rhinoceros unicornis) and the mugger crocodiles or marsh crocodiles (Crocodylus palustris) started to become extinct in the Sundarbans towards the middle of the 20th century, due to extensive poaching and man hunting by the British.[22] There are several other threatened mammal species, such as the capped langurs (Semnopithecus pileatus), smooth-coated otters (Lutrogale perspicillata), Oriental small-clawed otters (Aonyx cinerea), and great Bengal Civets (Viverra zibetha).
[edit]Economy
The Sundarbans plays an important role in the economy of the southwestern region ofBangladesh as well as in the national economy. It is the single largest source of forest producein the country. The forest provides raw materials for wood based industries. In addition to traditional forest produce like timber, fuelwood, pulpwood etc., large scale harvest of non wood forest products such as thatching materials, honey, bees-wax, fish, crustacean and mollusk resources of the forest takes place regularly. The vegetated tidal lands of the Sundarbans also function as an essential habitat, produces nutrients and purifies water. The forest also traps nutrient and sediment, acts as a storm barrier, shore stabilizer and energy storage unit. Last but not the least, the Sunderbans provides a wonderful aesthetic attraction for local and foreign tourists.
The forest also has immense protective and productive functions. Constituting 51% of the total reserved forest estate of Bangladesh, it contributes about 41% of total forest revenue and accounts for about 45% of all timber and fuel wood output of the country (FAO 1995). A number of industries (e.g. newsprint mill, match factory, hardboard, boat building, furniture making) are based on the raw materials obtained from the Sundarbans ecosystem. Various non-timber forest products and plantations help generate considerable employment and income generation opportunities for at least half a million poor coastal population. It also provides natural protection to life and properties of the coastal population in the cyclone prone Bangladesh.
[edit]Habitation
The Sundarbans has a population of over 4 million[29] but much of it is mostly free of permanent human habitation. Despite human habitations and a century of economic exploitation of the forest well into the late forty's, the Sundarbans retained a forest closure of about 70% according to the Overseas Development Administration (ODA) of the United Kingdom in 1979.
[edit]Administration
The Sundarbans area is one of the most densely populated in the world, and the population is increasing. As a result, half of this ecoregion's mangrove forests have been cut down to supply fuelwood and other natural resources. Despite the intense and large-scale exploitation, this still is one of the largest contiguous areas of mangroves in the world. Another threat comes from deforestation and water diversion from the rivers inland, which causes far more silt to be brought to the estuary, clogging up the waterways.
A new Khulna Forest Circle was created in Bangladesh back in 1993 to preserve the forest, and Chief Conservators of Forests have been posted since. The direct administrative head of the Division is the Divisional Forest Officer, based at Khulna, who has a number of professional, subprofessional and support staff and logistic supports for the implementation of necessary management and administrative activities. The basic unit of management is the compartment. There are 55 compartments in four Forest Ranges and these are clearly demarcated mainly by natural features such as rivers, canals and creeks.
[edit]Protection
The Bangladesh part of the forest lies under two forest divisions, and four administrative ranges viz Chandpai (Khulna District),Sarankhola (Khulna), and Burigoalini (Satkhira District) and has sixteen forest stations. It is further divided into fifty-five compartments and nine blocks.[1] There are three wildlife sanctuaries established in 1977 under the Bangladesh Wildlife (Preservation) Order, 1973 (P.O. 23 of 1973).The West Bengal part of the forest lies under the district of South & North 24 Parganas.
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