More than 20 people have been killed or are missing due to landslides and floods as monsoon rains lashed Nepal, the government said on Friday.
In Nepal, 27 people have died in floods and landslides after heavy rains hit the country's eastern region and the southern plains.
The center said nine key highways remained blocked by floods and mudslides, and attempts were underway to open them up for traffic. Among them is the East-West Highway that connects the country's southern districts. Continuing bad weather has grounded helicopter rescue flights.
"We have evacuated more than 150 people and are on the standby for rescue in different areas", army spokesman Bigyan Dev Pandey said. More than 10,000 people are estimated to have been displaced.
Rain-triggered floods, mudslides and lightning have left a trail of destruction in other parts of South Asia.
Nepal's weather department warned on Thursday that heavy rains were expected to continue for two days, and advised people to stay alert.
The annual monsoon rains, which normally start in June and continue through September, are crucial for Nepal, a country of 30 million people, and India, which both depend on the annual downpours for farming.
"A total of 869,024 people, including women and children, have been affected by the floods", the Assam State Disaster Management Authority (ASDMA) said.
The latest deaths took to 30 the number of people killed in incessant rain that since Thursday has pounded much of the Himalayan nation tucked between China and India.
Elsewhere in Assam, Kaziranga National Park, home to the endangered one-horn rhinoceros, has been flooded.
In neighbouring India 11 deaths have been recorded in the northeastern states of Assam and Arunachal Pradesh, officials said Friday. In Mizoram, floods have submerged about 400 homes in the small town of Tlabung, police said.