Trang authorities yesterday warned people not to swim at six waterfalls due to fears of flash floods.
They are Sai Rung, Doi Sawan, To Te, Ton Tok, Ka Chong and Lam Plok.
The warning came after continuous heavy rains, which might cause flash floods that originate in nearby mountains.
Officers are stationed at the falls.
In 2007, flash floods at Doi Sawan and Sai Rung waterfalls killed 38 people.