Dasan Pass, Baoji, Shaanxi 陕西宝鸡大散关
Dasan Pass, on Dasan Ridge southwest of Baoji, Shaanxi, commands the Chencang Road over the mountains from the Guanzhong plain to Hanzhong; with Wu Pass, Tongguan and Xiao Pass it is one of the Four Passes of Guanzhong. In the Chu–Han contention Han Xin slipped through here “secretly by way of Chencang”, and in the Three Kingdoms Zhuge Liang led his northern expeditions out through the pass. For a time it marked the border between the Southern Song and the Jin, recalled in Lu You’s line “Armoured horses in the autumn wind at Dasan Pass”.