What are the Territories in the novel, The Talisman?

The Territories are another world, described as the 'next world along' from out own mundane world. Although the Territories are smaller than the mundane world, they share many similar elements and themes. Many of the characters in the mundane world have 'Twinners' in the world of the Territories whose lives and actions mirror each other. It is in a sense a purer, more undiluted world than out own, and the realm that Jack and his various travelling companions variously have to 'jump' into or out of to avoid being captured.