《徐霞客游记·楚游日记一》
大概地说紫云山在云阳山尽头处，而赤松坛在云阳山正东麓。
盖紫云为云阳尽处，而赤松为云阳正东之麓。
Generally speaking, Ziyun Mountain is located at the end of Yunyang Mountain, and the Chisong Altar is at the eastern foot of Yunyang Mountain.