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One can generally say that the entire Great Wall runs along the lower borders of today's 内蒙古Inner Mongolia. Although at different times the Wall was shifted higher or lower, it was more or less in the same pattern dictated by geography. And almost its entire length, save the northeast section, borders or runs through sandy or bare deserts. Of interest to this page is the section that runs through the sandy desert areas within the great bend of 黄河Huanghe (Yellow River) - going southwest in a low dip passing the frontiers of 神木Shenmu, 榆林Yulin, 靖边Jingbian, 定边Dingbian, 盐池Yanchi, and then turning back up toward 银川Yinchuan.
This region, known as the Ordos, has strategic importance in the far past; and the earliest records indicated frequent fighting in this area. The invading normads or 匈奴Xiongnu in the north would normally cross the Yellow River and settle in this area. From here the horsemen can move quickly down to the Han capitals, such as 西安Xian and 咸阳Xianyang. The great goals of generals in those times is to drive them out of this area. During the Qin dynasty, general Meng Tian stationed in this area after he drove the Xiongnu beyond the Huanghe. Of these places I had been to Yulin city, and from there I took the bus to one of its counties, Dingbian. Between Dingbian and Yanchi is this section of the Great Wall which I simply call 定边长城 - 三五九旅窑洞Dingbian's Great Wall