A "paraelemental plane" is a plane that is between one of the four major elemental planes: Earth, Fire, Air, and Water. It is where the substances of two planes blend into each other, until one has crossed into the other. It consists of a nearly infinite expanse of the substance.
The original four paraelemental planes were
- The Paraelemental Plane of Ooze
- The Paraelemental Plane of Magma
- The Paraelemental Plane of Smoke
The concept of a specific paraelemental plane was abandoned in third edition, and remains abandoned in fourth and fifth edition. However, later editions contain less "pure" elemental planes that can easily accomodate the locations that were present in these planes before.