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When you build a country on a flood plain, it floods. How weird is that?
Low-lying Bangladesh floods often. The country is built over the flood plains of three major rivers, the Brahmaputra, Meghna, and Ganges Rivers. The three rivers converge in Bangladesh and empty into the Bay of Bengal through the largest river delta in the world. The flat land within each flood plain is fertile, and the country is densely populated. As a result, floods on any of the three rivers can affect a vast number of people. When all of the rivers run high with monsoon rains and melting snow from the Himalaya Mountains (the source of the rivers), much of Bangladesh can be under water.
http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=15682
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