Located in the northwest of Taiyuan,Kelan has provided a natural defense for the northwest of Taiyuan.Especially in the Song and Ming Dynasties,both countries suffered serious border crisis in the northern regions.The rulers of the Song and Ming dynasties continuously strengthened their military defense systems,and many of the remains still exist today.The Song Great Wall in Wangj iacha is a rela-tively complete site from the Song Dynasty.The remains from the Ming dynasty are mainly the military defense buildings such as the ancient Kelan site,the gate,San Jing fortress,San Cha fortress,and five garrison stations.All these are the important part of the ancient Kelan military defense system.%处于太原西北的岢岚,历来就是太原的西北屏障。特别是在宋、明这两个北部边疆危机严重的朝代,宋明统治者不断加固其军事防御体系,至今仍多有遗存。现存宋代较完整的是王家岔宋长城遗址。明代存留至今的则主要是岢岚古城遗址、城门、三井堡、三岔堡及五个屯所这些军事防御建筑。这些都是古代岢岚的军事防御体系极重要的部分。
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