There are several zones which pass through the Near Umbra. If the Near Umbra can be seen as a triple-layer cake, zones exist as slices into the cake. An ant walking across a layer might keep walking over a slice, or he might travel into the slice. So it is with zones. An individual could walk travel through the Astral Reaches without ever knowing she has just stepped through a zone, or she might enter into the zone and find an entirely new realm of existence within.
