Bytopia

The Twin Paradises were the homes of spirits and powers that believed in the forces of good.

Description
The two layers of this plane are joined at one barrier which happens to be the whole sky, about 10 miles (16km) above sea level. Gravity for each layer is normal for that layer but switches direction as soon as you cross the barrier. The inhabitants of one layer can look up and see the other layer hanging upside down high overhead.

Layers
The Golden Hills, home of the gnome pantheon, is located here.
 * Layer 1: Dothion

Martyrdomain, realm of Ilmater, is located here.
 * Layer 2: Shurrock