The floods have spread throughout the state's 14 districts and left more than one million people cut off from transport routes, as major roads are under water.
Over 400 villages have been flooded, and large areas of farmlands have been damaged since the Kosi River, nicknamed the "Sorrow of Bihar," burst its banks and changed course.
India's monsoon season, which usually occurs from early July to September, is vital for harvesting but regularly inflicts major destruction.
In early August floods swept along the coast of the Bay of Bengal in the south of the country, affecting around 50 neighborhoods in Hyderabad, the capital of Andhra Pradesh, and killing over 70 people.
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