In the Guangxi region, which borders Vietnam, week-long downpours triggered floods in six cities, killing 12 and affecting more than 570,000 people, Xinhua said, citing the regional emergency management department.
It added that houses collapsed and crops were damaged.
Rainfall was expected to intensify through Thursday, the regional weather bureau said, according to Xinhua.
In neighboring Guangdong province, seven people were killed and one was missing as heavy rain destroyed roads and toppled houses, the report added.
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