Inner planes

Inner planes is the collective term for a subset of the known planes of existence in the Great Wheel cosmology model. The term refers to the placement of the planes at the center of the concentric spheres that made up the Great Wheel model. The Inner planes were also called the Elemental planes because each one was primarily made up of one type of matter. There were six major and 12 minor Elemental planes and they could be reached from the Prime Material Plane by traveling through the Ethereal plane. The six major Inner planes were:
 * Elemental Plane of Air
 * Elemental Plane of Fire
 * Elemental Plane of Earth
 * Elemental Plane of Water
 * Positive Energy plane
 * Negative Energy plane

In the World Tree cosmology model, which became popular with some scholars before the Spellplague, the Inner planes were moved to the roots of the World Tree and the more appropriate name Elemental planes was used to describe them as a group.