Pakistan is appealing for further international assistance as floods devastate the country, leaving people searching for higher, drier ground.
The death toll from the monsoon rains has reached 1,033 - with 119 killed in the previous 24 hours, the National Disaster Management Authority says.
The US, UK, UAE and others have contributed to a disaster appeal, but more funds are needed, officials say.
Pakistan's government is doing everything it can to help, they add.
Speaking to the BBC, interior ministry official Salman Sufi said the country was desperate for international support.
"Pakistan has been grappling with economic issues, but now just when we were about to overcome them the monsoon disaster hit," he said.
Funding from a lot of development projects had been rerouted to the affected people, he added.
In the north-west of the country, thousands of people fled their homes after rivers in Khyber Pakhtunkhwa province burst their banks, causing powerful flash floods.
"The house which we built with years of hard work started sinking in front of our eyes," Junaid Khan, 23, told the AFP news agency. "We sat on the side of the road and watched our dream house sinking."
The province of Sindh in the south-east of the country has also been badly affected, with thousands displaced from their homes.
'No food has come here'
Pumza Fihlani, BBC News, Sindh
There were displaced people in all of the villages we drove through across Sindh.
Floods are not uncommon in Pakistan but the people here tell us these rains were different. They were more than anything that's ever been seen here. One local official described them as "floods of biblical proportions".
Near the city of Larkana, thousands of mud homes have sunk under water, and for miles all that's visible is treetops.
Where the water level is slightly lower, thatched roofs creep out from underneath the menacing water.
The needs of the survivors are varied. In one village we visit, the people sat there are desperate for food. In another they say they've got their grains, but they need money to meet their other needs.
We visit one where many children have developed waterborne diseases. A mobile truck pulls over and scores immediately run towards it. Children carrying other children make their way to the long queue.
Pakistan's Prime Minister Shehbaz Sharif said 33 million people had been hit by the floods - about 15% of the country's population.
He said the losses caused by floods this season were comparable to those during the floods of 2010-11, said to be the worst on record.
Officials in the country blame climate change for the devastation.
But poor local government planning has exacerbated the impact in the past, with buildings often erected in areas prone to seasonal flooding.