Many Bangladeshis are fleeing to higher ground
Some 14 million people have been displaced in India alone and clashes have been reported over food drops in the worst hit Bihar state.
Aid workers are battling to supply food and water to millions of increasingly desperate flood victims.
However, life in flood-affected southern Nepal is returning to normal after weeks of torrential rains.
Water levels in some north Indian rivers are now receding but food, water and medicine is still not reaching those who need it most.
Clashes were reported over food drops in the worst hit area, India's state of Bihar, where 11 million are affected.
Federal ministers are expected to visit the worst-affected areas to try and assess the damage on Tuesday.
'More resources needed'
Aid agencies have warned of the outbreak of diarrhoea and other water-borne diseases.
Bihar officials have blamed Nepal over the water levels
Bihar's latest victims were in a boat that capsized on the Ganges. Two people are confirmed dead and dozens are missing.
More than 20 million people have been affected across areas of northern India, Bangladesh and Nepal.
Potheri Unnikrishnan, from the humanitarian group Actionaid, said he expected pockets of flooding to continue causing problems for months.
"It is absolutely necessary that everyone - the government, the NGOs and the international community - put more resources to fight this out," he said.
Many villagers have not had supplies for days while rescuers said they had had little rest since the flooding began.
Bhagwan Manjhi from Bihar's East Champaran district told local television: "We are surviving on snails as we have nothing to eat."
Bihar and Nepal have clashed over who is responsible for the water levels.
Officials in Bihar accused Nepal of failing to build dams to control Himalayan water.
Disease risk
But an MP in Nepal, Purna Kumari Subedi, blamed a dam built in India at Laxmanpur, telling AFP that it should be destroyed.
THE ASIAN MONSOON Monsoon winds blow north-easterly for one half of the year, and from the south-west for the other half South-westerly winds bring the heavy rains from June to Sept Winds arrive in southern India six weeks before the north west Annual rainfall varies considerably
What is the monsoon? In pictures: Bangladesh flood
Although rains have generally eased, water levels coming down from Nepal are unlikely to lower soon, officials said.
Levels have lowered in areas such as Assam but officials said they were worried about an outbreak of disease as waters receded and temperatures soared.
Officials in Uttar Pradesh said they expected the situation to get better soon with water in three rivers - the Ghagra, Rapti and Gandak - receding.
In Bangladesh, the UN's World Food Programme has been distributing emergency aid to flood-hit areas.
The agency estimated that one million people had been directly affected and some were in need of urgent assistance.
In Nepal, many roads in the flooded areas have been cut and bridges have been washed away.
It is proving hard for aid agencies and the government to bring help.
They have distributed food supplies to some communities, but many people who are still living in damaged mud and thatched homes complain it is not enough.
Las inundaciones han abatido duramente a India


Las intensas lluvias monzónicas se han detenido, aunque la cifra de muertos se ha elevado a 347 por las inundaciones en el Sur de Asia, sobre todo India, Bangladesh y Nepal.

Más de 25 millones de personas se han visto damnificadas por las inundaciones y han tenido que desplazarse.

Al menos 191 personas han muerto en India, el país más afectado por las lluvias.

En el condado pobre de Bihar, el jefe del manejo de desastres Manoj Srivastava reportó que más de 6.000 poblados habían sido inundados, y 11,5 millones de personas afectadas. Dos millones de estas no han encontrado refugio y viven al descubierto.

La gente se ha visto aislada y se han armado varios conflictos por la comida. "Sobrevivimos de caracoles ya que no tenemos nada que comer", declaró un afligido.

Cerca de 6.600 paquetes con comida han sido repartidos por las zonas afectadas.

En Bangladesh, la cifra de muertos ha sobrepasado los 156, reportaron oficiales locales. Al menos unas 36 muertes fueron confirmadas este lunes. En Nepal, la cifra de muerto sería de al menos 93.

=== Enfermedades ===

"Hay muchas posibilidades de que haya una plaga epidémica en el estado", dijo el Dr. Nareswar Dutta de Assam.

Aunque las lluvias han parado, las posibilidades de que el agua se retire rápidamente son bajas mientras que las posibilidades de una epidemia son altas.

Doctores han comenzado a repartir medicinas para evitar diarrea, alergias de la piel y otras enfermedades causadas por las inundaciones.

Sin embargo, oficiales de Uttar Pradesh declararon que la situación mejoraría ya que los ríos Ghagra, Rapti y Gandak han comenzado a bajar sus niveles.

"Los niveles de agua de otros ríos han comenzado a bajar o están constantes", dijo Mahindra Awasthi, un portavoz de la Comisión Central de Agua de Lucknow, la capital del estado.

Aunque los esfuerzos para repartir alimentos en las áreas afectadas son arduos, los habitantes que aún viven en hogares corroídos y dañados manifiestan que "no es suficiente".