The Celestial Realm was just the middle realm between the lower Mundane Realm and the upper Immortal Realm.
The Nine Celestial Fraternity was one of the many celestial fraternities that were in the Celestial Realm and was the biggest celestial fraternity that consisted of ten vast divine realms.
The Celestial Realm was unlike the lower Mundane Realm where there were vast oceans and lands.
The entire Celestial Realm was consisted of endless lofty mountains and it was thousands of times bigger than the lower Mundane Realm.
The many celestial cultivation sects and populations were situated high above the mountains.