The Sundarbans is the largest single block of tidal halophytic mangrove forest in the world. The Sundarbans is a UNESCO World Heritage Site covering parts of Khulna, Satkhira and Bagerhat District in southwestern Bangladesh.

Located in Bangladesh, the Sundarbans borders the Sundarbans National Park in the Indian state of West Bengal. Sundarbans is divided into three protected forests in Bangladesh namely Sundarbans South, East and West Wildlife Sanctuary. This region is densely covered by mangrove forests, and is one of the largest reserves for the Bengal tiger.

The Bengal tiger (Panthera tigris tigris) is the most numerous tiger subspecies. Its populations have been estimated at 1,706--1,909 in India, 440 in Bangladesh, 163--253 in Nepal and 67--81 in Bhutan. Since 2010, it has been classified as an endangered species by the IUCN. The total population is estimated at fewer than 2,500 individuals with a decreasing trend, and none of the Tiger Conservation Landscapes within the Bengal tiger's range is large enough to support an effective population size of 250 adult individuals.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).

Bengal is traditionally fixed as the typical locality for the binomial Panthera tigris, to which the British taxonomist Pocock subordinated the Bengal tiger in 1929 under the trinomial Panthera tigris tigris.

It is the national animal of both India and Bangladesh. As of 2004, population estimates in Bangladesh ranged from 200 to 419, mostly in the Sunderbans. This region is the only mangrove habitat in this bioregion, where tigers survive, swimming between islands in the delta to hunt prey. Bangladesh's Forest Department is raising mangrove plantations supplying forage for spotted deer. Since 2001, afforestation has continued on a small scale in newly accreted lands and islands of the Sundarbans. From October 2005 to January 2007, the first camera-trap survey was conducted across six sites in the Bangladesh Sundarbans to estimate tiger population density. The average of these six sites provided an estimate of 3.7 tigers per 100 km2 (39 sq mi). Since the Bangladesh Sundarbans is an area of 5,770 km2 (2,230 sq mi) it was inferred that the total tiger population comprised approximately 200 individuals. In another study, home ranges of adult female tigers were recorded comprising between 12 and 14 km2 (4.6 and 5.4 sq mi)., which would indicate an approximate carrying capacity of 150 adult females. The small home range of adult female tigers (and consequent high density of tigers) in this habitat type relative to other areas may be related to both the high density of prey and the small size of the Sundarbans tigers.

Since 2007 tiger monitoring surveys have been carried out every year by WildTeam in the Bangladesh Sundarbans to monitor changes in the Bangladesh tiger population and assess the effectiveness of conservation actions. This survey measures changes in the frequency of tiger track sets along the sides of tidal waterways as an index of relative tiger abundance across the Sundarbans landscape.

source - Wikipedia

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