East of the Sun and West of the Moon

From the text:

"So, so; it's you, is it?" said the old woman. "Well, all I know about him is, that he lives in the castle east of the sun and west of the moon, and that you'll get there too late or never; but still you may borrow my horse, and you can ride him to my next neighbor. Maybe she'll be able to tell you; and when you get there just give the horse a switch under the left ear, and beg him to be off home. And you can take this golden apple along with you."