Location: the Spirit Realm

The Spirit/Demon Realm is referred to collectively as the Spirit Realm. Ask a spirit, and only the spirit half of the realm is the Spirit Realm, the other half being the Demon Realm.

The Spirit Half
The Spirit Half is a bustling metropolis. Landmarks include Spiritown, - the quiet capital famous for its nasty burgers - Overworld Clouds, - the popular tourist attraction - and the Moonkeep Temple - an oasis of peace and quiet reflection.

The Demon Half
The Demon Half is much like some shantytown. Mountains and pillars of rock stick up out of the ground at random, with housing attached to them at equally random points. The place commonly known as Dusty Dusty Ruins is really King Sippah's old castle.