Somewhere other than our world. It's separate, different and inaccesible, eg Lord of the Rings, Discworld, Curse of Chalion
15 (75.0%)

Somewhere else but accessible from our world, eg Narnia, Elidor, Andre Norton's Witchworld
10 (50.0%)

All mixed up with our world, but the magic is hidden from most people, eg Garner's Weirdstone of Brisingamen, War for the Oaks, Elizabeth Bear's Blood and Iron, The Dark is Rising
9 (45.0%)

Other, I'll explain in the comments.
5 (25.0%)