One of the eight passes is the eastern gate and important pass of Luoyang, located in Heshui Town, 16 kilometers northwest of Xingyang City, Henan Province. As the eastern gate and important pass of Luoyang, Hulaoguan is named after King Mu of Zhou. This pass is connected with Songyue in the south, bordering the Yellow River in the north, crisscrossing mountains and mountains, and is a dangerous one. Laihu knows something about history and culture.