Spirit Realm Mountain is the most important barrier separating the Outer Realm from the Real World and Spirit Realm.
There is a legend that Spirit Realm Mountain is the domain membrane born to protect the newborn world during each realm cycle. Other legends say it is a sacred artifact of the Human Race, transformed from flesh and blood by the ancestors to resist the Outer Realm invasion.
But regardless of which legend, Spirit Realm Mountain is a towering wall encasing the entire Real World and Spirit Realm, isolating the Outer Realm.
However, it wasn't until arriving at the foot of Spirit Realm Mountain that Fang Ze understood why a wall would be called: Spirit Realm Mountain.
Gazing at the towering mountain that seems to enclose the stars in its height, looking at the lush Spirit Realm vegetation and trees on the mountain, viewing the steep slopes resembling cliffs...
If Fang Ze were to name it, he would probably also call this massive wall a "mountain."