The Invisible Landscape Charted (SB)

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In the introduction, we provided quotes from several spirits, each featuring a wildly different description of the spirit world. Now, as DM, you clearly see that the spirit world doesn't exist, but, like its inhabitants, is shaped by the thoughts and notions of mortals.
However, players like maps. They like to be able to refer to places and locations they've previously heard of or seen. To maintain the illusion that the spirit world is an actual place nested between the Astral and the Ethereal Planes (or wherever a shaman may believe it to be), you may wish to impose the following "standards" on the spirit world:
* Overall, the spirit world has the same shape and appearance as the campaign's prime-material world. All spirits originate from the thoughts and feelings of people or from events on the material world, and so remain tied to it, geographically.
* The position of a spirit in the spirit world corresponds to one or more places on the Prime Material Plane. From these places that spirit can be contacted, and it can affect the material world, and can possess victims or manifest itself.
* The area a spirit can inhabit is the only "spirit world" that it is aware of. Spirits may know of other spiritual entities, either because their conception dictates this (as with hero and nemesis spirits), or because shamans have told them that other spirits exist.
* The final and firmest ground rule is that no character may enter the spirit world, either physically or through psychic projection. While the feelings and ideas which formed the spirits and their worlds are very real, they do not create a real, solid, actual place that a character can visit.