Bytopia

From Manuel of the Planes (3e):

It is the plane that faces itself.

It is the home of the gnomes.

It is two sides of the same coin.

Bytopia is unique among the Outer Planes because the surfaces of its two layers face each other like the covers of a closed book. By looking up from Dothion, the "top" layer of the plane, the traveler can see Shurrock, its other layer. In a similar fashion, one may stand on Shurrock and see the towns and farms of Dothion overhead.

Each layer of the Bytopian plane is an idealized world. Dothion is a tamed, pastoral landscape, while Shurrock is an untamed wilderness. The philosophy of the plane—personal achievement working with social interdependence —infuses both its layers.

The distance between the two layers of the plane is about a mile, though sharp mountains rise from either side and sometimes meet in the middle. Travel between the two layers is common by flying as well as climbing the mountains.

Bytopia is divided into two layers, each facing the other. The Astral Plane reaches both of these layers, though the more settled layer, Dothion, is considered the first layer. In general, outsiders and petitioners live on Dothion and go adventuring and exploring on Shurrock.

Vision on Bytopia is just as it would be on the Material Plane at that particular time of day. Both layers of Bytopia share a day and night cycle, though the radiance comes from the border between the two layers. It brightens during the day to the brilliance of noon, then subsides, until the border itself is invisible and night falls.

There is no moon on Bytopia, and the stars are the campfires and town-lights of the layer directly above. As a result, there are few stars on Dothion's half of the plane, while there are many on wild Shurrock.