Events described in Anno Ruini series take place in a Universe that is quite similar to the one we inhabit.
It comprises three realms: Heavenly, Earthly, and Underly. While Heavenly and Underly Realms are based on Tradition and given to the gods and the demons respectfully, the Earthly Realm is where us people live.
You'll find this realm resembling our Earth in many ways. Getting the grip on how the names sound, you can be successful at guessing where they are situated.
Start with places from ‘Takuan of Koto’.