叶尔羌河
The fertile oasis is fed by the Yarkand River, which flows north down from the Karakorum mountains and passes through the Kunlun Mountains, known historically as the Congling mountains (lit. 'Onion Mountains' - from the abundance of wild onions found there). The oasis now covers , but was likely far more extensive before a period of desiccation affected the region from the 3rd century CE onwards.