Aerial photo taken on Aug. 9, 2019 shows a section of the Qumar River, a source of the Yangtze River, in Yushu Tibetan Autonomous Prefecture, northwest China's Qinghai Province. Sanjiangyuan, a major natural reserve in northwestern China, saw rising vegetation coverage in 2019, according to the latest monitoring data. Sanjiangyuan, meaning the "source of three rivers," is home to the headwaters of the Yangtze, Yellow and Lancang rivers. The environmental quality remained stable in the area compared with the previous year, with grassland coverage reaching 77 percent, according to the report released by authorities of Qinghai Province. (Xinhua/Wu Gang)
