Lower Cloud Heaven.
This world was located in the westernmost part of the Nine Heavens Immortal Realm.
Unlike the other eight worlds, more than half of Lower Cloud Heaven was filled with seawater.
The blue sea water was boundless, and various tall mountains and dangerous islands stood on the sea.
Waves surged, water vapor lingered, and rainbows filled the sky.
In the endless sea, near the western border of the Lower Cloud Heaven, there was an island that was hundreds of millions of kilometers tall and was always enveloped in thick spiritual mist.
This island was the incomparably ancient and mysterious prehistoric ancient island.
The area within 15 million kilometers of the ancient island was filled with connate spirit energy.
From time to time, lightning of all colors would flash in the thick spiritual mist, emitting an ancient and dangerous aura.