Hundreds of people have been displaced by the flood.
Some 36 people were missing in 23 districts across the country's densely populated southern plains, which border India.
Red Cross volunteers and emergency teams are searching for survivors as flash floods and landslides have submerged thousands of homes in several parts of Nepal, mostly in the south of the country.
"We have more than 30 people confirmed dead".
A hotel owner said they used elephants to transport tourists to the nearest open highway and airport to help them return to the capital Kathmandu.
In the popular jungle safari resort of Sauraha in Chitwan, hotels were forced to shift their guests to higher floors as waters rushed into the premises.
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The flooding and landslides have cut communications and electricity in many affected areas. Other roads remain blocked by the landslides, slowing down the rescue efforts.
Chief District Officer Narayan Prasad Bhatta said trapped tourists were being evacuated to safer places.
Nepal Cabinet on Saturday had held an emergency meeting during which Prime Minister Sher Bahadur Deuba had ordered the local district administrations to intensify the rescue and release activities.
The District Natural Disaster Rescue Committee has distributed dry foods to victims in the flood-hit areas.
Issuing a statement following an emergency meeting on Sunday, the human rights watchdog appealed the Nepal government, security agencies, national and worldwide organizations to expedite the rescue and relief operation in flood and landslide affected settlements.
The weather forecasting office says more rain is expected on Sunday throughout the country. Officials have warned that the death toll could increase because at least 17 people are still missing.