Nine Realms

Was the Black Yellow Great World. The Nine Realms are independent of each other.

The Nine Realms were formed after the disintegration of a complete Great Realm, and in other words, Nine Heavens, Milky, True Force, and the Three Middle Realms are just its fragments. They divided the realms into the upper, middle, and lower ones according to their sizes, strength, resources and the channels, which linked them.