The Dark Tower series of novels, by Stephen King, contain references to numerous locations. Some of those locations are listed below.
All-World is the world known to contain the "Keystone Tower" in the Dark Tower series. It is the only world that contains the Dark Tower in its physical form; all others contain a representation of the Tower, such as a rose. From All-World, it is possible to actually enter the Dark Tower. All-World is divided into three regions.
In-World is the heart of All-World, where Gilead once lay before its fall.
Mid-World is where the first book in the series begins. This is where most of the story takes place.
End-World is the outer borders of All-World, and it is here where Can'-Ka No Rey and The Dark Tower are.
As the Dark Tower contains all of existence, within various realms and times, there are varying different versions of Earth contained within.
The following locations occur outside of the normal realms inhabited by humans in The Dark Tower series. Characters can only reach some of them using magic or man-made teleportation doors.