Photo taken on May 24, 2019 shows a yak on the bank of Yamzbog Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. The Yamzbog Yumco Lake is regarded as one of the three largest sacred lakes in Tibet. (Xinhua/Jigme Dorje)

Photo taken on May 24, 2019 shows the scenery of the Yamzbog Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. The Yamzbog Yumco Lake is regarded as one of the three largest sacred lakes in Tibet. (Xinhua/Purbu Zhaxi)

Aerial photo taken on May 24, 2019 shows the scenery of the Yamzbog Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. The Yamzbog Yumco Lake is regarded as one of the three largest sacred lakes in Tibet. (Xinhua/Jigme Dorje)

Photo taken on May 24, 2019 shows the scenery of the Yamzbog Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. The Yamzbog Yumco Lake is regarded as one of the three largest sacred lakes in Tibet. (Xinhua/Purbu Zhaxi)

Photo taken on May 24, 2019 shows the scenery of the Yamzbog Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. The Yamzbog Yumco Lake is regarded as one of the three largest sacred lakes in Tibet. (Xinhua/Purbu Zhaxi)

Photo taken on May 24, 2019 shows the scenery of the Yamzbog Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. The Yamzbog Yumco Lake is regarded as one of the three largest sacred lakes in Tibet. (Xinhua/Purbu Zhaxi)