The Qilian Mountains (), together with the Altyn-Tagh sometimes known as the Nan Shan, as it is to the south of the Hexi Corridor, is a northern outlier of the Kunlun Mountains, forming the border between Qinghai and the Gansu provinces of northern China.
The eponymous Qilian Shan peak, situated some 60 km south of Jiuquan, at , rises to 5,547 m. It is the highest peak of the main range, but there are two higher peaks further south, Kangze'gyai at with 5,808 m and Qaidam Shan peak at with 5,759 m. Other major peaks include Gangshiqia Peak in the east.
The Nan-Shan range continues to the west as Yema Shan (5,250 m) and Altun Shan (5,798 m). To the east, it passes north of Qinghai Lake, terminating as Daban Shan and Xinglong Shan near Lanzhou, with Maoma Shan peak (4,070 m) an eastern outlier. Sections of the Ming dynasty's Great Wall pass along its northern slopes, and south of northern outlier Longshou Shan (3,616 m).
The Qilian mountains are the source of numerous, mostly small, rivers and creeks that flow northeast, enabling irrigated agriculture in the Hexi Corridor (Gansu Corridor) communities, and eventually disappearing in the Alashan Desert. The best known of these streams is the Ejin River. The region has many , the largest of which is the Touming Mengke. These glaciers have undergone acceleration in their melting in recent decades.
Lake Hala is a large Brackish water lake, located within the Qilian mountains.
The characteristic ecosystem of the Qilian Mountains has been described by the World Wildlife Fund as the Qilian Mountains conifer forests.
Biandukou (扁都口), with an altitude of over 3500 m, is a pass in the Qilian Mountains. It links Minle County of Gansu in the north and Qilian County of Qinghai in the south.
The Tuyuhun were based around the Qilian mountains.
The mountain range was formerly known in European languages as Richthofen Range after Ferdinand von Richthofen, who was the Red Baron's explorer-geologist uncle.Winchester, Simon. (2008). The Man Who Loved China: the Fantastic Story of the Eccentric Scientist Who Unlocked the Mysteries of the Middle Kingdom, p. 126.
The mountain range gives its name to Qinghai's Qilian County.
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