Geography
Area: 147, 570 sq. km. (55,813 sq. mi.); about the size of Wisconsin.
Cities: Capital--Dhaka (pop. 10 million). Other cities--Chittagong (2.8 million), Khulna (1.8 million), Rajshahi (1 million).
Terrain: Mainly flat alluvial plain, with hills in the northeast and southeast.
Climate: Semitropical, monsoonal.

Bangladesh Geography:
Bangladesh is a low-lying, riverine country located in South Asia with a largely marshy jungle coastline of 710 kilometers (440 mi.) on the northern littoral of the Bay of Bengal. Formed by a deltaic plain at the confluence of the Ganges (Padma), Brahmaputra (Jamuna), and Meghna Rivers and their tributaries, Bangladesh's alluvial soil is highly fertile but vulnerable to flood and drought. Hills rise above the plain only in the Chittagong Hill Tracts in the far southeast and the Sylhet division in the northeast. Straddling the Tropic of Cancer, Bangladesh has a subtropical monsoonal climate characterized by heavy seasonal rainfall, moderately warm temperatures, and high humidity. Natural calamities, such as floods, tropical cyclones, tornadoes, and tidal bores affect the country almost every year. Bangladesh also is affected by major cyclones--on average 16 times a decade.

Urbanization is proceeding rapidly, and it is estimated that only 30% of the population entering the labor force in the future will be absorbed into agriculture, although many will likely find other kinds of work in rural areas. The areas around Dhaka and Comilla are the most densely settled. The Sundarbans, an area of coastal tropical jungle in the southwest and last wild home of the Bengal Tiger, and the Chittagong Hill Tracts on the southeastern border with Burma and India, are the least densely populated.
source: http://www.state.gov