Aerial photo taken on June 10, 2021 shows a water system under construction in Linze County, Zhangye City, northwest China's Gansu Province. Photo: Xinhua

Aerial photo taken on June 10, 2021 shows a water system under construction in Linze County, Zhangye City, northwest China's Gansu Province. Photo: Xinhua

Aerial photo taken on June 16, 2021 shows a view of a river system in Linze County, Zhangye City, northwest China's Gansu Province. Linze County is located in the southern edge of Badain Jaran Desert, the third largest desert in China, with Heihe River, China's second largest inland river, passing through the county. Photo: Xinhua

Aerial photo taken on June 16, 2021 shows a view of a river system in Linze County, Zhangye City, northwest China's Gansu Province. Linze County is located in the southern edge of Badain Jaran Desert, the third largest desert in China, with Heihe River, China's second largest inland river, passing through the county. Photo: Xinhua