The Borderlands

Any plane that does not physically interfere with the Material is considered to be part of the borderlands. Due to their isolation, these realms can be exceptionally dangerous and inhospitable.

The Outlands
The Outlands is the most hospitable plane of The Borderlands, and is very similar to the universe in composition. It's likeness is only an illusion however, as the plane shifts and transforms according to the unconscious whims of those in the material. As a result, the plane is a ever shifting mismatch of landscapes.

The plane's morphic properties also allow visiting primes to modify their surroundings at will. For example, some primes posses the ability to alter the lands around them, change their appearances or abilities, or create objects out of thin air. Such activities can gain a traveler unwanted and dangerous attention however, and unfortunately, any alteration or object created in The Outlands instantly and violently evaporates if brought outside of it.

There are areas in the Outlands that are unable to be modified by primes however. The Outer Planes and The Obelisk both inhibit such abilities. In addition to this, things created in these areas can be taken to other planes.

Many fantastical cities can be found within the Outlands, but most are quite odd and of no use to travelers. The city of Annolor, which circles The Obelisk, is one of the few exceptions.

The Outer Planes
The Outer Planes are not wholly independent planes. Instead, they are simply secluded sections of The Outlands that were claimed and subsequently modified by the Planar Gods. Nonetheless, their remoteness and drastic differences are enough to consider them separate locales.

The sixteen outer planes are listed here.