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Bangladesh is a country in South Asia. It is bordered by India on all sides except for a small border with Burma (Myanmar) to the far southeast and by the Bay of Bengal to the south. Together with the Indian state of West Bengal, it makes up the ethno-linguistic region of Bengal. The name Bangladesh means 'Country of Bengal' in the official Bengali language.

The borders of present-day Bangladesh were established with the partition of Bengal and India in 1947, when the region became the eastern wing of the newly-formed Pakistan. However, it was separated from the western wing by 1,600 kilometres (1,000 mi) across India. Political and linguistic discrimination as well as economic neglect led to popular agitations against West Pakistan, which led to the war for independence in 1971 and the establishment of Bangladesh, with the help of India. However, the new state had to endure famines, natural disasters and widespread poverty, as well as political turmoil and military coups. The restoration of democracy in 1991 has been followed by relative stability and economic progress.

Bangladesh is among the most densely populated countries in the world and has a high poverty rate. However, per-capita (inflation-adjusted) GDP has more than doubled since 1975, and the poverty rate has fallen by 20% since the early 1990s. Dhaka and other urban centers have been the driving force behind this growth. Geographically, the country straddles the fertile Ganges-Brahmaputra Delta and is subject to annual monsoon floods and cyclones.

Bangladesh is located in the low-lying Ganges-Brahmaputra River Delta or Ganges Delta. This delta is formed by the confluence of the Ganges (local name Padma or Pôdda), Brahmaputra (Jamuna or Jomuna), and Meghna rivers and their respective tributaries. The Ganges unites with the Jamuna (main channel of the Brahmaputra) and later joins the Meghna to eventually empty into the Bay of Bengal. The alluvial soil deposited by these rivers has created some of the most fertile plains in the world. Bangladesh has 58 trans-boundary rivers, making water issues politically complicated to resolve - in most cases as the lower riparian state to India.

Most parts of Bangladesh are less than 12 metres (39 ft) above the sea level, and it is believed that about 50% of the land would be flooded if the sea level were to rise by a metre (3 ft). The highest point in Bangladesh is in Mowdok range at 1,052 metres (3,451 ft) in the Chittagong Hill Tracts to the southeast of the country.

A major part of the coastline comprises a marshy jungle, the Sundarbans, the largest mangrove forest in the world and home to diverse flora and fauna, including the Royal Bengal Tiger. In 1997, this region was declared endangered.

Straddling the Tropic of Cancer, Bangladeshi climate is tropical with a mild winter from October to March, a hot, humid summer from March to June. A warm and humid monsoon season lasts from June to October and supplies most of the country's rainfall. Natural calamities, such as floods, tropical cyclones, tornadoes, and tidal bores occur almost every year, combined with the effects of deforestation, soil degradation and erosion. Cox's Bazar, south of the city of Chittagong, has a beach that stretches uninterrupted over 120 kilometres (75 mi).

In September 1998, Bangladesh saw the most severe flooding in modern world history. As the Brahmaputra, Ganges and Meghna spilt over and swallowed 300,000 houses, 6,000 miles (9,700 km) of road and 1,600 miles (2,600 km) of embankment 1,000 people were killed and 30 million more were made homeless with 135,000 cattle killed, 50 square kilometres of land destroyed and 11,000 kilometres of roads damaged or destroyed. Two-thirds of the country was underwater. There were several reasons for the severity of the flooding. Firstly, there were unusually high monsoon rains. Secondly, the Himalayas shed off an equally unusually high amount of melt water that year. Trees that usually intercept rain water were cut down for firewood or to make space for animals!