Mangdang Mountain should belong to Dangshan Mountain. How can I be assigned to Yongcheng, Henan?

Before the Song Dynasty, Dangshan County (later renamed as Dangshan County, Anyang County and Jiedang County) was a county in the south of Dangshan County, Anhui Province. Most administrative offices were around Dangshan, and Dangshan County was then called "Xiayi County" and "Xiazhi County". Today, the name of Dangshan County in Anhui Province comes from Mangdang Mountain. Later, in order to distinguish Dangshan in Anhui, it was called Mangshan, where Dangshan County was originally located.

Please don't fantasize. If you want to belong to it, the south of Dangshan belongs to "Mangshan" and does not belong to Dangshan today. Mangdang Mountain is not in Dangshan County, and its name is wrong. You have this time fantasy, so you might as well save some time to develop Dangshan economy.