The Reincarnation Hall was located in the lowest part of the Netherworld, which was also closest to the original source of the Netherworld, and it could also be said to be in the deepest part of the Six Paths Reincarnation Dish.
The Six Paths Reincarnation Dish was the foundation of the Netherworld and the most powerful magic treasure in the Prehistoric World, second only to the Open Sky Divine Axe, even more powerful than the Three Treasures of Opening Heaven.
This treasure was unimaginably enormous, roughly equivalent to nearly half of the Netherworld. It was precisely because of its vastness that it could accommodate the reincarnation of countless living beings.
Otherwise, just the creatures from the Three Realms that fell daily were countless, let alone those from all the Heavens and Myriads of Worlds. How could the Six Paths Reincarnation Dish accommodate so many living beings if it were not large?