Aerial photo taken on July 2, 2019 shows the Hukou Waterfall in its flood period on the Yellow River in Linfen, north China's Shanxi Province. (Photos: Xinhua/Liu Hongda)

Aerial photo taken on July 2, 2019 shows the Hukou Waterfall in its flood period on the Yellow River in Linfen, north China's Shanxi Province.

Aerial photo taken on July 2, 2019 shows the Hukou Waterfall in its flood period on the Yellow River in Linfen, north China's Shanxi Province.

Aerial photo taken on July 2, 2019 shows the Hukou Waterfall in its flood period on the Yellow River in Linfen, north China's Shanxi Province.