Ravenloft, otherwise known as the Demi-Plane of Dread and Land of Mists
It is heavily derived from outside places, including established settings, including Forgotten Realms, Dragonlance, Greyhawk, Dark Sun, Masque of the Red Death, Mystara, Eberron, Birthright, and Pathfinder.
It is named after two castles named Castle Ravenloft, the first of which is ironically outside of the Ravenloft setting.
See List of Domains
- Domains of Dread article at the Forgotten Realms Wiki, a wiki for the Forgotten Realms campaign setting.