<P> It is composed of a labyrinth of channels, swamps, lakes, and flood plain sediments (chars). The Gorai - Madhumati River, one of the distributaries of the Ganges, divides the Ganges Delta into two parts: the geologically young, active, eastern delta, and the older, less active, western delta . </P> <P> Between 125 and 143 million people live on the delta, despite risks from floods caused by monsoons, heavy runoff from the melting snows of the Himalayas, and North Indian Ocean tropical cyclones . A large part of the nation of Bangladesh lies in the Ganges Delta, and many of the country's people depend on the delta for survival . </P> <P> It is believed that upwards of 300 million people are supported by the Ganges Delta, and approximately 400 million people live in the Ganges River Basin, making it the most populous river basin in the world . Most of the Ganges Delta has a population density of more than 200 people per km (520 people per square mile), making it one of the most densely populated regions in the world . </P> <Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (February 2013) (Learn how and when to remove this template message) </Td> </Tr> </Table>

Write a short note on ganga brahmaputra delta