In the Planescape campaign setting for Dungeons & Dragons, Bytopia is the Twin Paradises (bi- + utopia). People of Lawful Good and Neutral Good alignment are reborn here as petitioners after death.

Bytopia is physically unique in the sense that the two layers are laid over one another, each looking down (or up; the terms are relative here) at the other. A traveller can look up from one layer and see the other above him looking back down (or, from the other side's perspective, up), provided that the sky is clear. To get from one layer to the other, travellers must either climb tall mountains, or fly. Gravity reverses when someone reaches the middle point between the two layers. The two layers are:

1. Dothion, the pastoral layer, home to the souls of farmers, craftsmen, honest merchants and other normal commoners.
2. Shurrock, the mountainous, untamed layer, home to the gods of the gnome pantheon and to a number of hidden beasts and monsters. Rangers often foray into this wilderness to slay creatures that have threatened the folk of Dothion.