Aerial photo taken on Sept. 19, 2019 shows an island in the Puma Yumco Lake in Shannan City, southwest China`s Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Aerial photo taken on Sept. 19, 2019 shows the scenery at the Puma Yumco Lake in Shannan City, southwest China`s Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Aerial photo taken on Sept. 19, 2019 shows the Duiwa Village near the Puma Yumco Lake in Shannan City, southwest China`s Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Aerial photo taken on Sept. 19, 2019 shows the scenery at the Puma Yumco Lake in Shannan City, southwest China`s Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Aerial photo taken on Sept. 19, 2019 shows an island in the Puma Yumco Lake in Shannan City, southwest China`s Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Aerial photo taken on Sept. 19, 2019 shows a road near the Puma Yumco Lake in Shannan City, southwest China`s Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Aerial photo taken on Sept. 19, 2019 shows the Duiwa Village near the Puma Yumco Lake in Shannan City, southwest China`s Tibet Autonomous Region. (Xinhua/Jigme Dorje)

Aerial photo taken on Sept. 19, 2019 shows the scenery at the Puma Yumco Lake in Shannan City, southwest China`s Tibet Autonomous Region. (Xinhua/Jigme Dorje)