What is the setting of The Lion, the Witch and the Wardrobe by C. S. Lewis?

Narnia is the book's primary setting, a country both magical and medieval. The countryside is generally unsettled and what might be described as uncivilized, in that it is inhabited almost entirely by animals and mythical creatures like dryads (spirits of trees), naiads (spirits of water), and other fairy tale/fantasy creatures like dwarfs, fauns, centaurs, and giants.