About half the total area is actively deltaic and is prone to flooding in the monsoon season from May through September.
The Ganges/Padma River flows into the country from the northwest, while the Brahmaputra/ Jamuna enters from the north.
He said: 'Children are sacred of me so I do not go out much but their parents have been kind to us. Mamun said: 'This man not only wants to get treatment but he is also keen on starting working again. We are doing every bit to help him and our in touch with health department.'It is always nice if people come forward to help such patients get treatment.
'For decades, they have been contributing food or money to run our family.' The frail man, whose days are spent restricted inside his tiny shanty, however, wishes to work on his own.
Haroon, from Narayanpur in Chandpur district, said: 'I drag my feet to walk. If I am sitting I need help of someone to stand.'Tumours began to appear on his body when he was nine.
His illiterate, poverty-stricken parents relied on alternative treatments and doctors to stop the growth - but nothing worked.
The vast river delta area is home to the dominant plains culture.
The hilly areas of the northeast and southeast are occupied by much smaller tribal groups, many of which have strongly resisted domination by the national government and the population pressure from Bangladeshis who move into and attempt to settle in their traditional areas.
The Chittagong Hill Tracts have extensive hardwood forests.
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A Bangladeshi man hasn't walked in 40 years - because of a mystery condition that has caused a six stone tumour to grow on his thigh.
Haroon Patwari, 53, has his whole body riddled with tiny tumours, one of which has grown to enormous proportions on his upper right leg.
Children are 'scared' of Haroon, forcing him to live as a recluse which has left him 'frustrated', according to local reports.