Joint name for Mount Xiao and [[函谷关|函谷關|han2 gu3 guan1]] in Henan Province; traditionally a strategic military region in northwest China known for its difficult terrain.

mountain range located in Henan province

(literary) Hangu Pass, a strategic pass built by the State of Qin during the Warring States period; also called [[秦關|秦關|qin2 guan1]]