More than 120,000 people have now been evacuated in northeast China following serious floods there and in North Korea.
Heavy rains have burst the Yalu river, flooding areas near their border. The Xinhua news agency reports further rain is expected.
The Liaoning province in China is the worst hit as the nation struggles with its worst floods in a decade.
More than 700 people died in a landslide triggered by heavy rains in Zhouqu county, Gansu, last week.
More than 5000 people have been moved to safety in North Korea, after parts of Sinuiju city and rural communities near the border were completely inundated.
North Korea's official KCNA news agency reported military units have been deployed to assist the rescue.
Sinuiju lies on a vital trade route for North Korea. The BBC reports previous flooding has exacerbated problems in a country where millions have died in famines over the last two decades.