Where did Tso Lan's domain located? We see no clues/hints at all. According to Jackie, each of the 8 Demon Sorcerers has his/her own domain.
Would the location of their portals have anything to do with their domains? If that is the case, I would guess the moon, or at least a place with very high altitude (so that it is close to the moon).
Maybe. Po Kong, it seems, only had Japan, so it is possible. But I can't help but wonder about remote or sparsely populated regions such as the Pacific islands or Antarctica.
What do you think?