Chapter 802

The strategic importance of Tongguan has made it a contested ground for military strategists throughout history. Situated in the eastern part of the Guanzhong Plain, it commands the vital choke points connecting the provinces of Shaanxi, Shanxi, and Henan. Its terrain is fiercely strategic: the Qinling Mountains rise to the south, the Jinggu Valley flanks the southeast, and twelve interconnected fortresses line the southern mouth of the valley. To the north, the Wei and Luo rivers converge and embrace the pass as they flow down toward the Yellow River, while Mount Hua and Mount Tai tower to the west. Mountains stack upon mountains, peaks press against peaks, valleys run deep, cliffs stand sheer, and the mountain paths are narrow. Through the center runs a single sheep-gut path, narrow enough that only a single cart and horse can pass at a time. In the past, people often used phrases like "so perilous a narrow path that even monkeys contend for it" and "of all paths under heaven, Tongguan alone holds true peril" to describe its extreme danger.