"...More than three hundred li away northeast of Pingxi Prefecture, there stands a lofty and perilous mountain range called the Jade Dragon. Mount Jade Dragon is a mostly deserted area with many rare beasts dwelling within. Facing Mount Qiyun, both mountains resemble a pair of dragons among the clouds. The head and body of Mount Jade Dragon are situated within the Gan Province, overlooking the Gulang Plains. Its tail extends into the center region of Mount Qiyun where the heavenly natural creation ends and fits the saying: 'One can see the head of the divine dragon but not its tail [1]. The valley at the intersection between Mount Jade Dragon and Mount Qiyun has a gap of less than one li at the narrowest point. The White Stone Pass sits here, as the military strategic location of Northwestern Gan Province…"— Memoirs of Pingxi Prefecture.