Nine people were reported killed in Hunan province and six in Guangxi, where vehicles were covered in mud and rocks along a mountain highway, local flood control offices said.

The deaths come after three people died Sunday in a landslide near the Guangxi city of Wuzhou.

Rains brought by last week's Typhoon Utor have caused severe flooding across Hunan, Guangxi and neighbouring Guangdong province. In Guangdong, 22 people have died and eight were missing in flooding since Friday.

By Tuesday morning, a total of 105 people were reported dead and 115 missing in the extreme south and northeast.

In the deadliest incident, torrential rains over the last week caused the Nei River in northeastern Liaoning province to overflow near the city of Fushun, sweeping away homes, roads and utilities and leaving 54 people dead and 97 missing.

Flooding hits China each summer, but heavy rains have brought greater than usual levels of destruction in some areas.