![](http://www.ecns.cn/hd/2023/11/28/8150aabb278f4154bf5b1b9154fa20c6.jpg)
Crystal ice floats in the upper stream of Heihe River in Qilian County, Haibei Tibetan autonomous prefecture, northwest China's Qinghai Province. (Photo: China News Service/Bao Lei)
Known as the "mother river of the Hexi Corridor", Heihe River is the second largest inland river in China with a total length of 928 kilometers, extending the provinces of Qinghai, Gansu and Inner Mongolia Autonomous Region.
![](http://www.ecns.cn/hd/2023/11/28/3179946f06f7414e9295168c3cb05d49.jpg)
Crystal ice floats in the upper stream of Heihe River in Qilian County, Haibei Tibetan autonomous prefecture, northwest China's Qinghai Province. (Photo: China News Service/Bao Lei)
![](http://www.ecns.cn/hd/2023/11/28/1024e7e1217c4f589aed772867e42f5a.jpg)
Crystal ice floats in the upper stream of Heihe River in Qilian County, Haibei Tibetan autonomous prefecture, northwest China's Qinghai Province. (Photo: China News Service/Bao Lei)
![](http://www.ecns.cn/hd/2023/11/28/c7e608f2913542ba91299634f5062aa7.jpg)
Crystal ice floats in the upper stream of Heihe River in Qilian County, Haibei Tibetan autonomous prefecture, northwest China's Qinghai Province. (Photo: China News Service/Bao Lei)
![](http://www.ecns.cn/hd/2023/11/28/5b49982f506b488aa3110d83bd37c67b.jpg)
Crystal ice floats in the upper stream of Heihe River in Qilian County, Haibei Tibetan autonomous prefecture, northwest China's Qinghai Province. (Photo: China News Service/Bao Lei)
![](http://www.ecns.cn/hd/2023/11/28/f421e9ebc3fb4621bd2dadec3bc8851c.jpg)
Crystal ice floats in the upper stream of Heihe River in Qilian County, Haibei Tibetan autonomous prefecture, northwest China's Qinghai Province. (Photo: China News Service/Bao Lei)