From the introduction:
Beyond the borders of what passes for civilisation in your world lie untamed lands. Lands that have not known the plough, the road or any permanent settlement. Here nature is in the ascendant and only the hardy survive. It is here that often the hunter becomes the prey.
In every campaign there should be areas of wilderness, Places where the writ of man does not run. It is the demesne of beasts, nomad tribes and fell monsters.
Unlike a dungeon or a town there are no boundaries on where a party of adventurers may roam. That said it is not as daunting to run as it sounds.