People flocked to Wanquan River in south China's Hainan Province to keep themselves cool on Saturday. /CFP

The local authority published level-four heat alert as temperatures in 11 cities and counties in Hainan soared over 37 degrees Celsius this week. /CFP

Temperature in some cities hit 39 degrees Celsius. /CFP

Drowning prevention was also mentioned by the authority. /CFP