Like what the Immortal Bai said at the Fruit Formation Temple, this patch of heaven and earth was not natural.
For instance, the three huge whirlpools on the ocean could hardly be explained by the natural laws.
The endless seawater fell down to the whirlpool and flew to the Alien Land and the underground beneath the northern Iceland in the far distance through the passages of heaven and earth.
This was problematic no matter how the phenomenon was explained.
Were these passages of heaven and earth built by nature?
Jing Jiu didn't have to answer this question right now; what he needed to solve at the moment was how to block the passage leading to the Underworld from the ocean.
