The Supreme Ancient Immortal Realms was at the very top of the thirty-three immortal realms. It was divided into a total of eight regions namely: the Heaven, Earth, Mystic, Yellow, Universe, Eternity, Chaos and Desolate regions. The division of these eight regions had another deeper layer of meaning behind them. For each of the eight regions, they had control over different lower worlds.
Among the thirty-three immortal realms, other than the Supreme Ancient Immortal Realms, there were still thirty-two immortal realms which are otherwise also known as the lower worlds. The peak powers of each region in the Supreme Ancient Immortal Realms had control over quite a few immortal realms, with one of the regions controlling three, the others four. Azure Mystic Immortal Realms was the only lower world yet to be controlled by any region or if not, just so nicely, each of the eight regions would control four lower worlds.