People participate in a canyoning competition at the Jindaoxia scenic area in southwest China's Chongqing, July 15, 2018. People across China joined in various water activities to seek cooling relief from the summer heat waves. (Xinhua/Qin Tingfu)

In this aerial photo taken on July 15, 2018, swimming fans swim in the Fengcheng River in Taizhou, east China's Jiangsu Province. People across China joined in various water activities to seek cooling relief from the summer heat waves. (Xinhua/Tang Dehong)

A man enjoys himself at a water amusement park in Weifang, east China's Shandong Province, July 15, 2018. People across China joined in various water activities to seek cooling relief from the summer heat waves. (Xinhua/Zhang Chi)

In this aerial photo taken on July 15, 2018, people have fun at a water amusement park in Linyi, east China's Shandong Province. People across China joined in various water activities to seek cooling relief from the summer heat waves. (Xinhua/Du Yubao)