Floods have forced more than four million people from their homes across India, Nepal and Bangladesh and killed more than 100 people as torrential rains in the initial days of monsoons wreaked havoc.
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The poor Indian states of Assam and Bihar have been among the worst hit.
About 4.3 million people have been displaced from their homes in Assam in the past 10 days due to rising waters across the mostly rural northeastern region, according to a government release on Monday.
Television channels showed roads and railway lines in Bihar submerged, with people wading through chest-high, churning brown waters, carrying their belongings on their heads.
Floods in South Asia cause mass displacement and deaths annually, and the death toll and damage from the current monsoon season, which has just begun, is likely to increase in coming weeks.
Flood waters in Assam rose overnight with the Brahmaputra River, which flows down from the Himalayas into Bangladesh, and its tributaries still in spate.
Most of the Kaziranga National Park, home to the rare one-horned rhino, was underwater, authorities in Assam said, adding that four people drowned on Monday.
"The flood situation has turned very critical with 31 of the 32 districts affected," Assam Chief Minister Sarbananda Sonowal told reporters. "We are working on a war footing to deal with the flood situation."
Army and paramilitary personnel have been deployed across the state for rescue and relief operations and makeshift shelter camps have been set up, while the air force is on standby, Keshab Mahanta, Assam's water resources minister, told Reuters.
The Indian weather office has forecast widespread rains across Assam and Bihar over the next two days.
In neighbouring Nepal, 64 people were killed and 31 were missing, with around a third of all districts hit by heavy rains, authorities said. Many of the deaths were caused by landslides that swept away houses.
In southeast Nepal, water levels on the Kosi River, which flows into Bihar, had receded, a district official said.
"Our analysis is that the danger is over now that the water level has come down," Chiranjibi Giri, assistant district administrator of Sunsari district, told Reuters.
In Bangladesh, floods forced an estimated 190,000 people out of their homes, government officials said.
In Cox's Bazar district, shelter to some 700,000 Rohingya refugees who fled violence in neighbouring Myanmar, more than 100,000 people have been displaced.
Since early July, flooding and landslides have damaged thousands of shelters at the refugee camps, killing two people, including a child, Human Rights Watch said in a release last week.
Australian Associated Press
