The rain-triggered floods have inundated 62,000 houses, 385 schools and 245 Buddhist pagodas, China's state-run Xinhua news agency reported Sunday.
"As water still continues to rise, there will be more people affected and evacuated in coming days," Keo Vy, chief of the Cabinet of the National Committee for Disaster Management, told Xinhua.
Prime Minister Hun Sen called on local authorities to monitor the floods and evacuate people to safe ground.
"The government would like to advise concerned ministries and authorities to be on high alert and prepare rescue measures to evacuate people to safe grounds so that fatalities and property damage by floods will be reduced," he said in a directive.
Gal Gadot cast as Wonder Woman for 'Batman vs. Superman'
Exploding whale video goes viral on Internet