About Jiuyu
To put it simply,
When I wrote it before, I wrote one less, but I have corrected it.
The lowest level of the mortal realm,
Tianji Domain created by the top ten families,
The Tribulation Immortal Realm where the Holy Court is located,
The Nether Realm is where the dead go, but the natives of the Nether Realm are used to calling their world the Illusion Sea, also called the Illusion Sea Realm.
There is also the Kunxu Domain where the Gods are located,
Evil Demon Realm, Blazing Fire Realm, Ghost and God Realm, and Cangxuan Realm.
This is the Nine Realms. The great wilderness mentioned before is not in the Nine Realms. It is its own entity. (End of chapter)