Celestia, commonly called in the past Mount Celestia, or more fully, the Seven Mounting Heavens of Celestia or even the Seven Heavens is a lawful good-aligned astral dominion that is currently ruled over by Torm as it drifts through the Astral Sea.
Celestia is the ultimate in law and good. All aspects of Celestia are beautiful and perfect; it is where the souls of many creatures of lawful good alignment go to Celestia after death. It is home to numerous celestial creatures including various types of archons, the petitioners of this plane.
As an outer plane, Celestia is spatially infinite, further consisting of seven infinite layers (or sub-planes). The seven individual layers form a colossal (perhaps infinite) mountain that rises from an infinite sea of holy water on the bottommost layer, to the summit on the topmost layer. Ascending the mountain is analogous to travelling through subsequently higher or ‘deeper’ layers to the top. Each of the different layers consists of various beautiful mountainous environments becoming more breathtaking the higher the mountain is ascended. Celestia’s first (bottommost) layer shares borders with the neighbouring planes of the Peaceable Kingdoms of Arcadia and the Twin Paradises of Bytopia; travel is possible between Celestia and these planes at certain locations.