1, elevation, pinyin chéng gāo, also known as Hulao Pass, was originally located in Guodong, Gudong. There is an ancient city of Gao Chao in the northwest of Hulaoguan Village, Sishui Town, Xingyang City, Henan Province.

2. The ancient country of Dongguo was a city ruled by Zheng in the Spring and Autumn Period, also known as Hulao Pass, Zheng in the Spring and Autumn Period and Warring States Korea. They are all important places, and Chu and Han are also deadlocked here. The Han Dynasty set up an elevation county, the Southern Song Dynasty set up Sizhou, and the Northern Wei Dynasty set up North Yuzhou, all of which ruled this place. Sui changed the county to Si Shui, and Tang moved Si Shui to the present. Today,