Wedge
There is a gap in Buzhou Mountain, which is rumored to be the only entrance from the immortal world to the human world. Due to the anger of Gonggong in ancient times, a catastrophe turned into the shape of stars and rivers, and even created the gap for immortals to come and go.
From Buzhou Mountain, you rise straight up three thousand feet, and you are directly facing the Nantian Gate of the Nine Heavens.