Enkeiei

…The Guando stretches for about 20km, with the Badaling of the Great Wall as the front line and the southern entrance as the rear guard, with a difference in elevation of 500m between them, and the Guando is located in the center. The Guando fortress, with a circumference of over 6km, was built during the Ming dynasty, when the Mongol invasion was at its most intense, and the Longqingwei (later renamed Yanqingwei) was established here, with a large number of garrison soldiers stationed there. Today, a marble arched gate stands across the road in the center of the Guando fortress, but this is the base of the Guojie Tower, built in 1343 (the third year of the Zhizheng era) during the Yuan dynasty to pray for safe travels. …

*Some of the terminology explanations that mention "Enkeiei" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…関道は万里の長城の八達嶺を前線とし，南口を後衛として約20km，その間に500mの高低の差があって，関はその中央に位置する。周囲6km余の関城は，モンゴルの侵入がもっとも激しかった明代に築かれたもので，ここに隆慶衛(のち延慶衛と改名)をおき多数の守備兵を駐屯させた。今この関城の中心に道路をまたいで，大理石のアーチ型の門が立っているが，これは元代，1343年(至正3)に交通安全を祈って建造された過街塔の台座なのである。…

※「延慶衛」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報