Only certain rooms in an area can be used by players to leave an area and enter into the overworld map. A player may only exit an area into the overworld map from 'exitrooms'. Such rooms will be those that could ICly be an exit for the area. In a city, for example, all city gates would be 'exitrooms'. In most terrain, all rooms will be considered 'exitrooms'. In addition, the first room a player enters in an area when leaving the overworld map will _always_ be considered an 'exitroom'. Using the <worldtravel> command in a room which is not designated as an 'exitroom' for the area will not take the player into the overworld.