Tibetannet

Aerial photo taken on Aug. 29, 2018 shows a view of Tongtian River at the Sanjiangyuan National Park in northwest China's Qinghai Province. Sanjiangyuan, meaning the "source of three rivers," is home to the headwaters of the Yangtze, Yellow and Lancang rivers. The ecological system has been steadily improving in recent years in the Sanjiangyuan National Park, making it a habitat of an increasing number of wild animals. (Photo by Pan Binbin/Xinhua) 

Aerial photo taken on July 26, 2021 shows the glacier at the source of the Yangtze River section of the Sanjiangyuan National Park in northwest China's Qinghai Province. Sanjiangyuan, meaning the "source of three rivers," is home to the headwaters of the Yangtze, Yellow and Lancang rivers. The ecological system has been steadily improving in recent years in the Sanjiangyuan National Park, making it a habitat of an increasing number of wild animals. (Xinhua/Zhang Long)

Photo taken on Aug. 25, 2020 shows a herd of Tibetan wild donkeys at the Sanjiangyuan National Park in northwest China's Qinghai Province. Sanjiangyuan, meaning the "source of three rivers," is home to the headwaters of the Yangtze, Yellow and Lancang rivers. The ecological system has been steadily improving in recent years in the Sanjiangyuan National Park, making it a habitat of an increasing number of wild animals. (Photo by Pan Binbin/Xinhua)

Aerial photo taken on July 27, 2021 shows a view of Qumar River at the Sanjiangyuan National Park in northwest China's Qinghai Province. Sanjiangyuan, meaning the "source of three rivers," is home to the headwaters of the Yangtze, Yellow and Lancang rivers. The ecological system has been steadily improving in recent years in the Sanjiangyuan National Park, making it a habitat of an increasing number of wild animals. (Xinhua/Zhang Long)

Tibetan antelopes are seen at Hol Xil area of the Sanjiangyuan National Park in northwest China's Qinghai Province, Sept. 28, 2021. Sanjiangyuan, meaning the "source of three rivers," is home to the headwaters of the Yangtze, Yellow and Lancang rivers. The ecological system has been steadily improving in recent years in the Sanjiangyuan National Park, making it a habitat of an increasing number of wild animals. (Xinhua/Xue Yubin)

A Tibetan antelope is seen at Hol Xil area of Sanjiangyuan National Park in northwest China's Qinghai Province, Sept. 28, 2021. Sanjiangyuan, meaning the "source of three rivers," is home to the headwaters of the Yangtze, Yellow and Lancang rivers. The ecological system has been steadily improving in recent years in the Sanjiangyuan National Park, making it a habitat of an increasing number of wild animals. (Xinhua/Xue Yubin)