居延海是我国第二大内陆河黑河的尾闾湖。汉时称居延泽，唐时称居延海，发源于祁连山深处的黑河，流经青海、甘肃、内蒙古三省区800余公里后，汇入巴丹吉林沙漠西北缘两片戈壁洼地，形成东、西两大湖泊，总称居延海。
第三，近年来快速恶化地区，比如南戈壁，明确的和中国这边的居延海干涸有直接关系。
Third, the rapid deterioration in recent years years, in areas such as the South Gobi, are clearly related to the drying up of the Juyuan Sea on the Chinese side.
例如在我国的内蒙古，原来有一个面积达300平方公里的居延海，而今天，它已经变成了300平方公里的居延沙漠。
For example, in the Inner Mongolia of China, there was an lake called Juyanhai, which is 300 square kilometers. But now it becomes a new desert called Juyan desert.
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