Monsoon floods in Pakistan over the last two weeks have killed more than 400 people and affected more than 4.5 million others, the government disaster relief agency has said.
In addition, tens of thousands of people have been made homeless by heavy flooding in the provinces of Balochistan and Sindh, officials say.
The floods began in early September in the north of the country.
Pakistan has suffered devastating floods in the past two years.
The worst floods were in 2010, when almost 1,800 people were killed and 21 million people affected.
The National Disaster Management Authority (NDMA) on Friday said that most of those hit by the latest floods flooding are in Sindh province - in the southern part of the country - where 2.8 million have been affected.
It said that nearly 890,000 people have been affected in Punjab province and 700,000 people affected in the province of Balochistan.
However a spokesman for the organisation said that the government was not yet appealing for foreign assistance.
"The government's point of view is that the situation will be handled from own resources," Ahmad Kamal told the AFP news agency.
The European Union on Friday announced additional funding of €15m ($19m/£11.7m) to help flood victims.
"These two largely unreported crises in [the north and south of] Pakistan are affecting tens of thousands of vulnerable people," Commissioner Kristalina Georgieva said.
"They are the victims of three consecutive years of devastating monsoon floods, which have destroyed livelihoods and left behind lingering food shortages and hunger."
Flooding has also affected the Indian state of Assam and northern parts of Bangladesh.