Photo taken on April 20, 2021 shows Tibetan antelopes in Hoh Xil, northwest China's Qinghai Province. Located in the southern part of Qinghai Province, the Sanjiangyuan region, or the sources of three rivers, namely the Yangtze River, Yellow River, and Lancang (Mekong) River, is an important ecological security barrier in China. Photo:Xinhua
Photo taken on April 20, 2021 shows Tibetan antelopes in Hoh Xil, northwest China's Qinghai Province. Located in the southern part of Qinghai Province, the Sanjiangyuan region, or the sources of three rivers, namely the Yangtze River, Yellow River, and Lancang (Mekong) River, is an important ecological security barrier in China. Photo:Xinhua
File photo taken on Dec. 1, 2016 shows a wild yak in Hoh Xil, northwest China's Qinghai Province. Located in the southern part of Qinghai Province, the Sanjiangyuan region, or the sources of three rivers, namely the Yangtze River, Yellow River, and Lancang (Mekong) River, is an important ecological security barrier in China. Photo:Xinhua
Aerial photo taken on Oct. 19, 2019 shows Kiangs (Equus kiang) in the Sanjiangyuan region, northwest China's Qinghai Province. Located in the southern part of Qinghai Province, the Sanjiangyuan region, or the sources of three rivers, namely the Yangtze River, Yellow River, and Lancang (Mekong) River, is an important ecological security barrier in China. Photo:Xinhua