Aerial photo taken on Sept. 12, 2020 shows the Yellow River Three Gorges scenic area, located upstream of the Xiaolangdi Dam, in Jiyuan, central China's Henan Province. (Xinhua/Hao Yuan)

Aerial photo taken on Sept. 12, 2020 shows the Yellow River Three Gorges scenic area, located upstream of the Xiaolangdi Dam, in Jiyuan, central China's Henan Province. (Xinhua/Hao Yuan)

Aerial photo taken on Sept. 12, 2020 shows the Yellow River Three Gorges scenic area, located upstream of the Xiaolangdi Dam, in Jiyuan, central China's Henan Province. (Xinhua/Hao Yuan)

Aerial photo taken on Sept. 12, 2020 shows the Yellow River Three Gorges scenic area, located upstream of the Xiaolangdi Dam, in Jiyuan, central China's Henan Province. (Xinhua/Hao Yuan)

Aerial photo taken on Sept. 12, 2020 shows the Yellow River Three Gorges scenic area, located upstream of the Xiaolangdi Dam, in Jiyuan, central China's Henan Province. (Xinhua/Hao Yuan)

Aerial photo taken on Sept. 12, 2020 shows the Yellow River Three Gorges scenic area, located upstream of the Xiaolangdi Dam, in Jiyuan, central China's Henan Province. (Xinhua/Hao Yuan)

Aerial photo taken on Sept. 12, 2020 shows the Yellow River Three Gorges scenic area, located upstream of the Xiaolangdi Dam, in Jiyuan, central China's Henan Province. (Xinhua/Hao Yuan)