The Planes

There are a number of planes which exist in the world. These are usually only accessible via magic such as the Plane Shift Spell, but there are exceptions. 
== Astral Sea ==
The Astral Sea is a location between planes? I think it's actually where things go when they're Lost, but not erased from existence such that they end up in Timeless Space. Palladia's tomb is known to be here. 
== Ethereal Plane ==
The ethereal plane is a location between planes. It is frequently used for transporting people and things via teleportation. 
== Feywild ==
The Feywild is a sort of echo of the material plane and counterpart to the Shadowfell. 
== Material Plane ==
The material plane, is the primary plane of existence. It is the primary setting of the various campaigns take place. 
== Shadowfell ==
The Shadowfell is one of the planes which can be accessed either through magic or through physical access in some areas of the material plane. It is a sort of echo or shadow of the material plane and a counterpart to the Feywild, which also holds a similar position. 
== Timeless Space ==
Timeless Space is not a plane of existence to which one can travel freely. Things that are thoroughly destroyed such that they are entirely erased from existence are the only things that end up in Timeless Space. There is no way to leave Timeless Space once you are there.