Aerial photo taken on Aug. 31, 2019 shows the scenery of the Yamzbog Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Aerial photo taken on Aug. 31, 2019 shows the scenery of the Yamzbog Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Aerial photo taken on Aug. 31, 2019 shows the scenery of the Yamzbog Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Aerial photo taken on Aug. 31, 2019 shows the scenery of the Yamzbog Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Photo taken on Aug. 31, 2019 shows the scenery of the Yamzbog Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Photo taken on Aug. 31, 2019 shows the scenery of the Yamzbog Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Photo taken on Aug. 31, 2019 shows the scenery of the Yamzbog Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Photo taken on Aug. 31, 2019 shows the scenery of the Yamzbog Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Photo taken on Aug. 31, 2019 shows the scenery of the Yamzbog Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorje)