|Notable inhabitants||Skeleton Princess|
The Boneyard Kingdom is the kingdom ruled by Skeleton Princess, according to Adam Muto. Not much is known about the Boneyard Kingdom. So far, it has only had a single, small appearance in the episode "Princess Monster Wife." The appearence shows Skeleton Princess lying in a bed. The bedroom appears to be the inside of a tree. The room is filled with small candles (and possibly candelabras).