Aerial photo taken on May 25, 2021 shows a view of Ngoring Lake in the Sanjiangyuan National Park in Golog Tibetan Autonomous Prefecture of 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/Li Zhanyi)