People use a rope to cross a river in the Gaur district of Rautahat, some 200km south of the capital Kathmandu on Wednesday. Phani Mahat/ AFP

• 90 people have died in Nepal and 50 in India's Assam state. A dozen people have been killed in Bangladesh
• 10 rare one-horned rhinos have died at the Kaziranga National Park

Officials say the death toll has risen to 152 in monsoon flooding in South Asia as millions of people and animals continue to face the brunt in three countries.

At least 90 people have died in Nepal and 50 in India's Assam state. A dozen people have been killed in neighboring Bangladesh.

A woman holds an elderly following heavy monsoon rains at a flood affected area of Gaibandha District, in Bangladesh, on Friday. Rehman Asad/AFP

Shiv Kumar, a government official in Assam, said on Saturday that 10 rare one-horned rhinos have died at the Kaziranga National Park after swirling grey waters of the Brahmaputra River burst its banks and entered the reserve.

The Assam Disaster Response Authority says 4.8 million people spread over 3,700 villages across the northeastern state are affected by the floods.

An Indian resident carries gas canisters as he wades through a flooded area following heavy monsoon rains in Muzaffarpur, Bihar, India. AFP

Monsoon rains hit the region in June-September. The rains are crucial for rain-fed crops planted during the season.

Associated Press