Realm of Koh

Description
Like other parts of the Spirit World, the Realm of Koh exists alongside the everyday physical world. The only way to visit Koh's realm is through a spirit gate, like the one in the Water Tribe Oasis. The spirit gate is a kind of porthole that allows spirits, and the Avatar, to move between the two worlds. Koh's realm is an eerie place, inhabited by a wide variety of spirit creatures. At the center of this realm is a large, gnarled tree whose roots extending into the sky, rather than the ground. Beneath this tree is Koh's lair. When Aang is in the Spirit World, his tattoos and eyes glow and he is very vulnerable. If his body is moved, then he will have a difficult time returning to the physical world.

Koh's Lair
Deep below a gigantic tree, is Koh's realm. When someone wants to find Koh, that's where they should go, always cautions not to show any emotion. Koh tries to scare visitors so to steal their faces.