Aerial photo taken on June 9, 2020 shows a boat on the water at the Tianhetan scenic area in Guiyang City, southwest China's Guizhou Province. (Xinhua/Ou Dongqu)

Aerial photo taken on June 9, 2020 shows tourists having fun at the Tianhetan scenic area in Guiyang City, southwest China's Guizhou Province. (Xinhua/Ou Dongqu)

Aerial photo taken on June 9, 2020 shows a view of the Tianhetan scenic area in Guiyang City, southwest China's Guizhou Province. (Xinhua/Ou Dongqu)

Aerial photo taken on June 9, 2020 shows a view of the Tianhetan scenic area in Guiyang City, southwest China's Guizhou Province. (Xinhua/Ou Dongqu)

Aerial photo taken on June 9, 2020 shows tourists having fun at the Tianhetan scenic area in Guiyang City, southwest China's Guizhou Province. (Xinhua/Ou Dongqu)

Aerial photo taken on June 9, 2020 shows a view in the Tianhetan scenic area in Guiyang City, southwest China's Guizhou Province. (Xinhua/Ou Dongqu)