Layers of the Outer Planes

Most of The Outer Planes include a number of distinct environments or realms. These realms are often imagined and depicted as a stack of related parts of the same plane, so travelers refer to them as layers. For example, Mount Celestia resembles a seven-tiered layer cake, the Nine Hells has nine layers, and the Abyss has a seemingly endless number of layers.
Most portals from elsewhere reach the first layer of a multilayered plane. This layer is variously depicted as the top or bottom layer, depending on the plane. As the arrival point for most visitors, the first layer functions like a city gate for that plane.

Primary Related Location

The Outer Planes