Planar Geography (GAP)

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The Astral touches the Prime Material Plane and every Outer Plane (at least their first layers). That said, a body must remember that the Astral doesn't really have any space of its own, so "touching" is a relative term. Perhaps it'd be better to say that the infinitesimal space of the Astral exists between all things on the Prime and Outer Planes.
But every berk knows where the Astral is and what it connects, right? It's the interplanar highway between all the Outer Planes. But why? Why does it "lie" where it does? Why can't a body use it to get to the Inner Planes, for example?
Well, that's simple. The Inner Planes embody physical reality. They're not concepts — they're the building blocks of reality. There's no room for the Astral among such dense stuff. No connection exists to the mental realm. The Astral links the mortals to the concepts that shape their consciousness, not to the fundamental elements that make up their worlds.