Record downpour hit Japan's southwest, killing at least six people with more rain expected in the region.

A general view shows a landslide site caused by heavy rainfall in Unzen, Nagasaki Prefecture, southwestern Japan, Aug. 15, 2021.

Residents return to check on their mud-covered homes in the country's southwest, where nearly 2 million people were urged to seek shelter on Saturday as dozens of rivers overflowed.

Local residents carry their belongings as they wade past a bus stop at a flooded street in Takeo, Saga Prefecture, Aug. 15, 2021.

Flooded residential area caused by heavy rain is seen from a helicopter in Takeo, Saga Prefecture, southwestern Japan, Aug. 14, 2021.

People take a rest at an evacuation center in Takeo, Saga Prefecture, Aug. 15, 2021.

A residential area flooded by heavy rain is seen from a helicopter in Takeo, Japan, Aug. 14, 2021.

A rescue worker wades through a flooded street looking for survivors in Takeo, Japan, Aug. 15, 2021.

A Saga prefectural rescue worker lifting up a resident to a helicopter from a house submerged by heavy rain during a rescue operation in Takeo, Japan, Aug. 14, 2021.

Rescue workers search for missing people at a landslide site caused by heavy rainfall in Unzen, Nagasaki Prefecture, southwestern Japan, Aug. 15, 2021.

A general view shows muddy water flowing during floods in Ureshino city, Saga Prefecture, Japan, Aug. 14, 2021.

A pedestrian looks out along a flooded street in Takeo, Saga Prefecture, Japan, Aug. 15, 2021.

Rescue members search for missing people following heavy rain in an area in Unzen, Nagasaki prefecture, Japan. Aug. 15, 2021.

A part of the road along the Haruke river collapsed due to flood water in Ogi City, Saga Prefecture, Aug. 14, 2021.

A woman rests at an evacuation center in Takeo, Saga Prefecture, Japan, Aug. 15, 2021.

A fire services department officer walks in front of a damaged house at the site of a landslide caused by heavy rain in Tagawa District, Fukuoka prefecture, Japan, Aug. 15, 2021.

A lizard is seen on a chair on a flooded street in Takeo, Saga Prefecture, western Japan, Aug. 15, 2021.

A general view shows muddy water during floods at Todorokinotaki water park in Ureshino city, Saga Prefecture, Japan, Aug. 14, 2021.

General view of fallen trees after heavy rain caused landslides in Ureshino city, Saga Prefecture, Japan, Aug. 14, 2021.

A woman pushes a bicycle through a flooded street as a man looks on, in Takeo, Saga Prefecture, Japan, Aug. 15, 2021.

A flooded house in Takeo, Saga Prefecture, western Japan, Aug. 15, 2021.