The Place Between was Christopher Chant's name for the rocky misty horrid difficult-to-reach but easy-to-leave place between the worlds. It is formally known as the World Edge. It is a place which links various parts of the Related Worlds, thus its name. The World Edge makes itself difficult to reach. Most people never find it. People who do find it, find it hostile and are eager to leave and the place encourages them to enter one of the Related Worlds it is attached to. Christopher's name for the Related Worlds is the Almost Anywheres.