Aerial photo taken on Aug. 20, 2018 shows the scenery of Zequ river in Rangtang County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Aerial photo taken on Aug. 20, 2018 shows the scenery of a village near Zequ river in Rangtang County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Aerial photo taken on Aug. 20, 2018 shows the scenery of a village near Zequ river in Rangtang County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Aerial photo taken on Aug. 20, 2018 shows the scenery of a mountain near Zequ river in Rangtang County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Aerial photo taken on Aug. 20, 2018 shows the scenery of Zequ river in Rangtang County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)