Aerial photo taken on May 27, 2018 shows the scenery of the Yamdrok Lake in Nagarze County of Shannan City, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorgi)

Aerial photo taken on May 27, 2018 shows the scenery of the Yamdrok Lake in Nagarze County of Shannan City, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorgi)

Aerial photo taken on May 27, 2018 shows the scenery of the Yamdrok Lake in Nagarze County of Shannan City, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorgi)

Aerial photo taken on May 27, 2018 shows the scenery of the Yamdrok Lake in Nagarze County of Shannan City, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorgi)

Aerial photo taken on May 29, 2018 shows the scenery of the Yamdrok Lake in Nagarze County of Shannan City, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorgi)

Aerial photo taken on May 27, 2018 shows the scenery of the Yamdrok Lake in Nagarze County of Shannan City, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorgi)

Aerial photo taken on May 27, 2018 shows the scenery of the Yamdrok Lake in Nagarze County of Shannan City, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorgi)