Many others are feared missing in the rubble of hundreds of houses and buildings which have been buried or destroyed. Millions have been left homeless as heavy rain led to rising river levels across the Himalayan region in Bhutan, Nepal and north-east India.
Officials say there are now signs the floodwaters are starting to recede.
However, aid agencies are warning of the threat of disease epidemics. There are fears that malaria, encephalitis and typhoid will claim more lives than the flooding itself. In India, rising floodwaters along the banks of the Brahmaputra river have already submerged the homes of more than two million people and left at least 80 dead. The Assam region is completely cut off Indian troops and engineers have joined Bhutanese army soldiers in the rescue work. Army and air force helicopters have dropped food, medicine and tents to hundreds of thousands of people stranded on rooftops.