Twenty-five rivers in southwestern China exceeded safe levels on Thursday, state media said, after more than 10,000 people were evacuated as the remnants of former typhoon Danas converged with East Asian monsoon rains.

Extreme rainfall and severe flooding, which meteorologists link to climate change, increasingly pose major challenges as they threaten to overwhelm ageing flood defences, displace millions and wreak havoc on a $2.8-trillion agricultural sector.

Heavy rains also hit the capital, Beijing, with one area in the sprawling Chaoyang district receiving 68.2 mm (2.7 inches) of rain in a single hour on Thursday morning, the state-run Beijing Daily said.

Ten southwestern rivers, including the Longyan, which flows through the densely populated region of Chongqing, could burst their embankments and levees at any time, broadcaster CCTV warned, citing the water resources ministry.

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