The Great Ring (PWH)

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See, the multiverse has a thing about rings. Rings wrap around everything and everything is a ring wrapping around itself. (That's the Unity of Rings at work.) But who needs philosophy, right? What's important is that the Outer Planes form a ring—the Great Ring, or the Great Wheel. (That's outer as opposed to inner, as in the Inner Planes. It's all in relation to the Prime Material Plane, which everyone says doesn't rate, but it must, since so much adjoins it.)
The Outer Planes only appear as a ring when they're drawn out on paper. But just 'cause some leatherhead sketches a picture of the planes and puts Mechanus next to Acheron, it doesn't mean that a planewalker can just hop across some physical border or boundary between the two. The infinitely big planes don't really lay out like countries on a map. Instead, they're organized according to outlook, good versus evil, order versus chaos—get the picture?
There're several ways to look at the ring. Most primes twig to the idea of the "good planes" and the "evil planes." When a cutter refers to the Upper (or "good") Planes, he's talking about the planes of Arcadia, Mount Celestia, Bytopia, Elysium, the Beastlands, Arborea, and Ysgard. The Lower—or "evil"—Planes are Acheron, Baator, Gehenna, the Gray Waste, Carceri, the Abyss, and Pandemonium. That's everything but Limbo and Mechanus, respectively the planes of purest chaos and law.
Another way to dissect the ring is by the planes' orientation towards law or chaos, which is as least as important (sometimes more so) to planewalkers than good and evil. On one side are the planes of law, which include Mount Celestia, Arcadia, Mechanus, Acheron, and Baator. The planes of chaos are Arborea, Ysgard, Limbo, Pandemonium, and the Abyss. What's left over—Bytopia, Elysium, the Beastlands, Gehenna, the Gray Waste, and Carceri—are the planes of conflict, sometimes called the planes of neutrality by berks who haven't been caught between the extremes of law and chaos.
* Two Rivers, a Mountain, and a Really Big Tree
* The Blood War
* The Abyss
* Acheron
* Arborea
* Arcadia
* Baator
* The Beastlands
* Bytopia
* Carceri
* Elysium
* Gehenna
* The Gray Waste
* Limbo
* Mechanus
* Mount Celestia
* Pandemonium
* Ysgard