The Elemental Realms were a grouping of planes composed of the realms of fundamental elements. These included the four "physical" elements: the Realm of Air, the Realm of Fire, the Realm of Earth, and the Realm of Water. These realms touched each other to form sub-realms of their combined elements, known as the Para-Realm of Ash, Para-Realm of Magma, Para-Realm of Ooze, and Para-Realm of Ice in the Great Wheel cosmology.
Some scholars also referred to the Positive Border and Negative Border planes as elemental, and the subject was frequent to much debate.