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As God was undergoing a battle with itself, the planet earth's Origin Core, which contained a consciousness of its own, was planning what to do.
It had to somehow destroy the many rifts that had emerged over the world…
Each rift that led to a dungeon would simply keep being open unless it were to be destroyed by defeating the Boss inside.
However, there were large uninhabited areas, so the gates that led to dungeons continued to pile up one by one within these areas.
The largest areas were, of course, the sea itself, even the depths of the ocean, there were gates with aquatic monsters rushing inside.
Check "The Protagnist's Sister Is Actually the Strongest"!