The death toll from the worst flooding to hit southern Thailand in decades rose to 22 as several thousand people remained confined to relief camps, and authorities warned of more heavy rain over the next few days.

The death toll from the worst floods in decades in southern Thailand and northern Malaysia climbed to at least 12 on Saturday, authorities said, as tens of thousands of people were evacuated due to rising water levels in the past three days.

There are worries in Malaysia and neighbouring Thailand that disastrous flooding could get worse as more rain comes.