Supernatural territory, the Demon Kingdom.
The Demon Kingdom territory is not bordering with the human's territory, they're deep inside the Supernatural territory.
There are seven Supernatural Kingdom territories that border with the human territory, the Vampire Kingdom, Werewolf Kingdom, Undead Tomb, Shapeshifter Temple, Fairy Forest, Dargonman Cave, and the Siren Kingdom.
Although their territory borders with the humans, they are wide apart.
For example, the Werewolf and the Dragonman.
They are tens of thousands of kilometers apart from each other, this makes them basically never meet except during the decennial GodKing Summit.
The Demon Kingdom territory neighbors with the Vampire, and the Undead.
Although they are neighboring each other, they are still hundreds of kilometers apart.
The Demon Kingdom is deep inside the Supernatural territory, their territory is a brazen land with no sign of life or water.