![](http://www.ecns.cn/hd/2021/09/26/39171b13906f4735a190786bddfccdcb.jpg)
A bird's eye view of the cloud-shrouded Tongtian River, a main stream of the source of the Yangtze River in northwest China's Qinghai Province. (Photo/China News Service)
![](http://www.ecns.cn/hd/2021/09/26/9e459dd994a841068c3ed48390734ff3.jpg)
Aerial photo shows the Tongtian River, a main stream of the source of the Yangtze River in northwest China's Qinghai Province. (Photo/China News Service)
![](http://www.ecns.cn/hd/2021/09/26/baf5805fdd34438f9d6e8ffe696e217c.jpg)
Aerial photo shows the Tongtian River, a main stream of the source of the Yangtze River in northwest China's Qinghai Province. (Photo/China News Service)