The great Deep Forest north of Serpent's Spine covers much of the northwestern part of the main Britannian continent. It is rich in animals, as well as several breeds of monsters. Nonetheless, the forest is vital for Britannia. In the midst of the forest lies Yew, the city of Justice, and its Moongate, west of it lies Empath Abbey and the Bee Cave, while north of it lies the Shrine of Justice. Also, within the forest live the Emps within the Emp Village and two companions of the Avatar in Iolo's Hut.
In all installments, the forest changed little.