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
Great Gobi A Strictly Protected Area an arid region of the Gobi desert. The vegetation is dominated by desert and desert steppe. Great Gobi A is generally drier than Great Gobi B. Together with Great Gobi B, the reserve was established in 1975 and has been designated by the United Nations as an international Biosphere Reserve in 1991. With a total area of about 46,369 km it is one of the largest reserves worldwide. The headquarters for the Great Gobi SPA is situated in Bayantooroi, a settlement about 20 km north to the Great Gobi A reserve. The Climate is extremely "continental". Temperatures in the Gobi