The edge of the Taklimakan desert. Alar, located at the southern foot of Tianshan Mountain, in the north of Tarim Basin, in the upper reaches of Tarim River where Aksu River, Yeerqiang River and Hotan River meet, is 80 30 ′ to 865 438+0 58 ′ east longitude and 40 22 ′ to 40 57 ′ north latitude.