Nearly 20 people have been killed by landslides that have followed torrential rain in India and Pakistan.
Nearly 20 other people are reported to have died in Pakistan in rain-related accidents, mostly collapsing houses.
Assam's government expects "more devastation" this week
The floods have also affected life in Nepal and Bangladesh where scores of people have died in the past few weeks.
Flooding has left more than a million people homeless as flooding worsens in India's north-eastern state of Assam.
Eleven people died when their houses were crushed outside the north-east Indian hill station of Darjeeling.
The landslips cut off the road between Darjeeling and Calcutta.
In Pakistan, eight people were killed when a mudslide engulfed their home in Karachi. The city has been severely disrupted by flooded streets.
River waters rise
Emergency camps have been set up in Assam to provide food, medicines and shelter to the homeless.
"The situation turned critical because massive showers in the past 24 hours caused all rivers to overflow their banks, inundating large stretches of villages and agricultural land," Assam Revenue Minister Mithias Tudu told Reuters.
More than 5,000 villages have been affected by the floods and 500,000 hectares of cropland submerged.
The situation was worst in Assam's northernmost district of Dhemaji, where more than 200,000 people were made homeless when several embankments gave way to the waters of the Gai and Jiadhol rivers.
Assam health officials say the outbreak of malaria has killed 71 and infected 15,000 more.
Reports say the death toll in Bangladesh has risen to 89 with more than a million and a half people affected.
At least 14 of the country's 64 districts had been hit.
Floods and landslides have also hit landlocked Nepal where at least 20 people have died over the past three weeks.
Many houses have collapsed and hundreds of hectares of farmland have been swept away.