Tourists pose for photos by the Puma Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region, July 4, 2023. (Xinhua/Chen Shangcai)

This photo taken on July 4, 2023 shows a view of the wetland by the Puma Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Chen Shangcai)

This aerial photo taken on July 4, 2023 shows a view of the wetland by the Puma Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Sun Fei)

This photo taken on July 4, 2023 shows a rainbow near the Puma Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Sun Fei)

This photo taken on July 4, 2023 shows a snow mountain near the Puma Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Liu Wenbo)

This photo taken on July 4, 2023 shows a Tibetan gazelle near the Puma Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Sun Fei)

This photo taken on July 4, 2023 shows a view of the Puma Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Chen Shangcai)

This aerial photo taken on July 4, 2023 shows a view of the Puma Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Sun Fei)

This aerial photo taken on July 4, 2023 shows a view of the Puma Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Sun Fei)

This photo taken on July 4, 2023 shows a view of the Puma Yumco Lake in Nagarze County of Shannan, southwest China's Tibet Autonomous Region. (Xinhua/Sun Fei)