A low pressure system made landfall in the central province of Quang Binh on Thursday, bringing torrential rains measuring 400-500mm.
On Friday afternoon, about 1,200 houses were submerged under 0.8 to 2.5 meters of water, according to the authorities.
Downpours and floods almost paralyzed the province. Many main streets in the town of Dong Hoi looked like rivers.
The national highway running through the province was heavily flooded, disrupting north-south traffic flows.
The severe weather conditions have also affected train services on the crucial north-south rail link. Multiple sections of the line remain inaccessible due to flooding and landslides.
