Photo taken on Aug. 9, 2020 shows the view of Nilaba wetland in Sertar County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Aerial photo taken on Aug. 9, 2020 shows the view of Nilaba wetland in Sertar County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Photo taken on Aug. 9, 2020 shows the view of Nilaba wetland in Sertar County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Photo taken on Aug. 9, 2020 shows the view of Nilaba wetland in Sertar County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Photo taken on Aug. 9, 2020 shows the view of Nilaba wetland in Sertar County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

A photographer takes photos at Nilaba wetland in Sertar County, southwest China's Sichuan Province, Aug. 9, 2020. (Xinhua/Jiang Hongjing)

Photo taken on Aug. 9, 2020 shows the view of Nilaba wetland in Sertar County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Photo taken on Aug. 9, 2020 shows the view of Nilaba wetland in Sertar County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Aerial photo taken on Aug. 9, 2020 shows the view of Nilaba wetland in Sertar County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Aerial photo taken on Aug. 9, 2020 shows the view of Nilaba wetland in Sertar County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Aerial photo taken on Aug. 9, 2020 shows the view of Nilaba wetland in Sertar County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Aerial photo taken on Aug. 9, 2020 shows the view of Nilaba wetland in Sertar County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Photo taken on Aug. 9, 2020 shows the view of Nilaba wetland in Sertar County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Photo taken on Aug. 9, 2020 shows the view of Nilaba wetland in Sertar County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Aerial photo taken on Aug. 9, 2020 shows the view of Nilaba wetland in Sertar County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)

Photo taken on Aug. 9, 2020 shows the view of Nilaba wetland in Sertar County, southwest China's Sichuan Province. (Xinhua/Jiang Hongjing)