Middle Planes
The Middle Planes is a term from Dungeons & Dragons introduced in the Planescape setting. It is a way of collectively referring to the three planes that are characterized by their prominent Neutral alignment as on the standard planar "map" these make up the center "spokes" of the Great Wheel, standing between the Upper Planes and the Lower Planes.
At a casual glance, the Middle Planes are the smallest planar grouping, having only three planes to call their own;
- The Clockwork Nirvana of Mechanus (Lawful Neutral)
- The Concordant Domain of the Outlands (True Neutral)
- The Everchanging Chaos of Limbo (Chaotic Neutral)
There are four other planes with strongly neutral traits... however, they actually sit as an intermediary point between Neutral and either Good (The Peaceable Kingdoms of Arcadia and The Heroic Domains of Ysgard), or Evil (The Infernal Battlefield of Acheron and The Windswept Depths of Pandemonium) and so some planar mapmakers will instead argue their membership as part of the Upper Planes and Lower Planes, respectively.