Planar Geography (GEP)

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The Ethereal Plane touches all the worlds of the Prime, webbing them together. While the Prime Material Plane is one plane, it's also subdivided into countless separate worlds contained within vast "crystal spheres." Conditions from world to world sometimes vary wildly; however, every world is considered part of the Prime.
No matter the number and size of the crystal spheres that make up the Prime Material Plane, the Border Ethereal (sometimes abbreviated to just "the Border") touches every portion of each crystal sphere. Whether or not the Border touches areas on the Prime between crystal spheres-sometimes called the phlogiston by well-lanned cutters-remains dark.
A body can access the Inner Planes, areas of elemental archetype, from the Ethereal. These planes, also called the Elemental Planes, are the foundation of all reality. Toe Border Ethereal touches the various elements of the Inner Planes just as it does the Prime. Many graybeards believe that this connection between the Inner Planes and the Prime is the single reason for the Ethereal's existence.
The Ethereal Plane does not border upon or in any way touch either the Astral or any of the Outer Planes; there is simply no natural connection. If a body on the Ethereal wants to access these mental and spiritual dimensions, she must use the Prime Material Plane as a waystop in between. Rumors persist of an as-yet-undiscovered plane connecting the Inner Planes directly with the Outer ones, but until proven with hard evidence, most bloods regard such talk as mere screed. 'Course, the "experts" have been proven wrong before.
The Border Ethereal itself is an interesting place. Although there is only one Border, it doesn't run in a continuous line. This means that a body can't walk from the area of the Border that touches the Prime to the area of the Border touching another plane or demiplane. A traveler has to enter the Deep and come out on the Border area touching her destination.
Here comes the barrny part. Some demiplanes touch upon the Border Ethereal-even though these pocket dimensions float in the Deep. See, conventional three-dimensional geography only gets a body so far on the Ethereal, because the plane isn't just a place, it's a state of being. Maps and sketches are just convenient ways for the Clueless to understand this place as best they can. Want to know the ultimate dark of the Ethereal? Nothing lies in relation to anything else, and nowhere is that more true than in the Deep. A body can't say that the Demiplane of Imprisonment floats 30 miles from the Demiplane of Time. Both demiplanes simply are. Any seeming relative distance merely lies in the perception of the beholder. Some bloods even think that everything in the Ethereal actually occupies the same "space," and individual areas just exist in a different state of being-whatever that means. However, a canny blood can't simply perceive herself (or enter a different state) and travel instantaneously to her destination. Distance is distance on this plane, even if it isn't "real."
So, how does a body get anywhere on the Ethereal? All this rattling about perceived distance and states of being is enough to addle even a graybeard's brain-box. The answer is simple: It depends on where you are. See, movement on the Border and in the Deep occurs somewhat differently. Generally, Border movement occurs like movement on any other plane, while movement in the Deep combines both physical and mental elements.