The death toll from floods sweeping South Asiainfo-icon has climbed above 1,000, officials said on Thursday, as rescue teams try to reach millions stranded by the region's worst monsoon disaster in recent years.

Thousands of soldiers and emergency personnel have been deployed across Indiainfo-icon, Bangladeshinfo-icon and Nepalinfo-icon, where authorities say a total of 1,009 bodies have been recovered since Aug 10 when intense rainfall started falling.

Twenty-six bodies were found on Wednesday in Bihar taking the death toll there to 367, said Anirudh Kumar, a top state disaster management official. "We still have nearly 11 million people affected in 19 districts of the state," he said, adding 450,000 flood evacuees had taken shelter in government refuges.

In Uttar Pradesh, floods have swamped nearly half the vast state of 220 million, India's most populous. Disaster management agency spokesman T P Gupta said 82 people had died and more than two million affected by the disaster there.

The state borders Nepal, where 146 people have died and 80,000 homes destroyed in what the United Nationsinfo-icon is calling the worst flooding in 15 years.

Nepal's home ministry warned the death toll could rise as relief teams reach more remote parts of the impoverished mountainous country.

In the Himalaya region in India's northwest, landslides caused by heavy rain have claimed 54 lives, the vast majority in one huge avalanche of mud that swept two buses off a mountainside.

The situation was slowly easing in West Bengal and Assam, where 223 people have died. Floods in Assam -- the second wave to hit the state in less than four months -- have wrought widespread destruction, killing 71 people and swathes of native wildlife. In West Bengal, where 152 people have died, hundreds of thousands have escaped submerged villages by boats and makeshift rafts to reach government aid stations.

In Bangladesh, water levels were slowly returning to normal in the main Brahmaputra and Ganges rivers. The government's disaster response body said on Thursday the death toll stood at 137, with more than 7.5 million affected since flooding hit the riverine nation.

Every year hundreds die in landslides and floods during the monsoon season that hits India's southern tip in early June and sweeps across the South Asia region for four months.