History of the Great Wall of China the three, China's chief concern since the earliest times had been Mongolia – the home of many of the country's fiercest enemies including the Xiongnu, the Xianbei, the Khitans, and the Mongols. The Gobi Desert, which accounts for two-thirds of Mongolia's area, divided the main northern and southern grazing lands and pushed the pastoral nomads to the fringes of the steppe. On the southern side (Inner Mongolia), this pressure brought the nomads into contact with China. For the most part, barring intermittent passes and valleys (the major one being the corridor through Zhangjiakou and the Juyong Pass), the North China
Hami Desert to take their place, the country went out of cultivation and eventually became the barren desert it is now. During the Hun time, and probably into the Middle Age, the present desert was a lush steppe grassland able to support sustainable seasonal nomadic horse husbandry on a large scale. Hami Desert The Desert of Hami (, Uyhgur: Қумул Қумлуқи) is a section of the Gobi Desert in Xinjiang, China that occupies the space between the Tian Shan system on the north and the Nan-shan Mountains on the south, and is connected on the west with the Desert of Lop. "This