Taklamakan Desert of water, accounts for the somewhat wide diurnal temperature variation. The Taklamakan Desert has very little water, therefore it is hazardous to cross. Merchant caravans on the Silk Road would stop for relief at the thriving oasis towns. It was in close proximity to many of the ancient civilizations — to the Northwest is the Amu Darya basin, to the southwest the Afghanistan mountain passes lead to Iran and India, to the east is China, and even to the north ancient towns such as Almaty can be found. The key oasis towns, watered by rainfall from the mountains, were Kashgar,
Taklamakan Desert by Turkic peoples. Starting with the Han Dynasty, the Chinese sporadically extended their control to the oasis cities of the Taklamakan Desert in order to control the important silk route trade across Central Asia. Periods of Chinese rule were interspersed with rule by Turkic, Mongol and Tibetan peoples. The present population consists largely of Turkic Uyghur people and ethnic Han people. This desert was explored by several scientists such as Xuanzang, a monk in the 7th century and by the archaeologist Aurel Stein in the 20th century. Atmospheric studies have shown that dust originating from the Taklamakan is blown over