Wu Pass or Wuguan was one of four strategic mountain passes along the southern border of the ancient state of Qin and the north western border of Chu.[1] Wuguan is a modern-day town in Danfeng County, Shaanxi Province.[2]
^Barbieri-Low, Anthony J.; Yates, Robin D.S. (2015-11-02). "Ordinances on Fords and Passes (Jinguan ling 津關令)". Law, State, and Society in Early Imperial China (2 vols): A Study with Critical Edition and Translation of the Legal Texts from Zhangjiashan Tomb no. 247. BRILL. pp. 1112–1166. doi:10.1163/9789004300538_040. ISBN978-90-04-30053-8.