DnDWiki:Inner Plane

The Inner Planes are comprised of the four elements; the fundamental forces which serve as the building blocks of the Prime Material Plane:

Fire

Earth

Water

Air

Also included with these four are the Positive and Negative Energy Planes, which radiate the power of life and death, respectively.

Although each Inner Plane is infinite, they also have edges where they overlap with each other, creating the Para-Elemental Planes:

Fire - Magma - Earth

Earth - Ooze/Mud - Water

Water - Ice - Air

Air - Smoke - Fire

In addition to overlapping with each other, the four elemental planes connect to the Positive Energy and Negative Energy planes, creating the Quasi-Elemental Planes:

Positive Quasi-Elements:

Fire - Radiance

Earth - Mineral

Water - Steam

Air - Lightning

Negative Quasi-Elements:

Fire - Ash

Earth - Dust

Water - Salt

Air - Vacuum