Photo taken on Aug. 7, 2018 shows the scenery of Beipanjiang river valley in Zhenfeng County, southwest China's Guizhou Province. (Xinhua/Tao Liang)

Photo taken on Aug. 7, 2018 shows the scenery of Beipanjiang river valley in Zhenfeng County, southwest China's Guizhou Province. (Xinhua/Tao Liang)

Aerial photo taken on Aug. 7, 2018 shows the scenery of Beipanjiang river valley in Zhenfeng County, southwest China's Guizhou Province. (Xinhua/Tao Liang)

Aerial photo taken on Aug. 7, 2018 shows the scenery of Beipanjiang river valley in Zhenfeng County, southwest China's Guizhou Province. (Xinhua/Tao Liang)

Photo taken on Aug. 7, 2018 shows the scenery of Beipanjiang river valley in Zhenfeng County, southwest China's Guizhou Province. (Xinhua/Tao Liang)

Aerial photo taken on Aug. 7, 2018 shows the scenery of Beipanjiang river valley in Zhenfeng County, southwest China's Guizhou Province. (Xinhua/Tao Liang)

Photo taken on Aug. 7, 2018 shows the scenery of Beipanjiang river valley in Zhenfeng County, southwest China's Guizhou Province. (Xinhua/Tao Liang)

Photo taken on Aug. 7, 2018 shows the scenery of Beipanjiang river valley in Zhenfeng County, southwest China's Guizhou Province. (Xinhua/Tao Liang)