Why is Dongshan the land of Long Mai?

Long Mai has nothing to do with Dongshan. If we say, it is estimated to be a little better than Xishan, because Taiyuan is called Longcheng because there are many emperors in Sui, Tang and Five Dynasties. Song Taizong, looking for Mr. Feng Shui, thinks that Zhoushan in the north of Yangqu County in Taiyuan is the dragon head, Tianlong Mountain in Jinyuan District of Taiyuan is the dragon tail, Taiyuan City is the dragon body, while Zhoushan and Tianlong Mountain belong to Luliang Mountain, and Dongshan Mountain in Taiyuan is the Taihang Mountain, so Long Mai has little to do with Dongshan. Even if there is a relationship, Xishan and Taiyuan are the first round.