Aerial photo taken on Aug. 22, 2019 shows the scenery of a wetland near Guangling County, north China's Shanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on Aug. 22, 2019 shows the scenery of a wetland near Guangling County, north China's Shanxi Province. (Xinhua/Tao Ming)

Photo taken on Aug. 22, 2019 shows the scenery of a wetland near Guangling County, north China's Shanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on Aug. 21, 2019 shows the view of Guangling County, north China's Shanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on Aug. 22, 2019 shows the view of Guangling County, north China's Shanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on Aug. 22, 2019 shows the view of a reservoir in Guangling County, north China's Shanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on Aug. 22, 2019 shows the scenery of a wetland near Guangling County, north China's Shanxi Province. (Xinhua/Tao Ming)

Aerial photo taken on Aug. 21, 2019 shows the view of Guangling County, north China's Shanxi Province. (Xinhua/Tao Ming)