Divine Country.
This is the domain and privilege of All Gods, a special space detached from the mundane world and also the dwelling place of the gods, each Divine's Divine Country being distinct.
In the game, the protagonist would enter the Divine Country through special means to challenge the gods, so Bai Wei, once a player, naturally had some understanding of the Divine Country.
This allowed him to surmise that the special realm he found himself in now, this so-called "Taoyuan Village," was likely Visas's "Divine Country."
The reason he used "likely" instead of certain was because Bai Wei was unsure whether Visas possessed a Divine Country, as logically, the Divine Country should be the privilege of the gods—so was Visas a god too?
According to the background description, Visas couldn't possibly be a god, so how exactly did he control this realm of Divine Country?