How monsoon changed India's geography

Millions of people have been driven from their homes by monsoon rains that caused an unexpected shift in direction of a major river in northern India.

India's Kosi river as it flowed on 8 August 2008

Until last week, the Kosi, a tributary of the Ganges, curved westwards out of Nepal in a C-shape. But in the torrential rains that have hit the region, the river burst its banks and diverted southwards through the state of Bihar, into a channel it had followed 200 years previously.

The Kosi's course on 24 August 2008

Dozens of people have died and more than two million have been displaced in the floods.

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