Question

why is across the border called fairyland​

Answer 1

Folklore. Fairyland may be referred to simply as Fairy or Faerie, though that usage is an archaism. It is often the land ruled by the "Queen of Fairy" and thus anything from fairyland is also sometimes described as being from the "Court of the Queen of Elfame" or from the Seelie court in Scottish folklore.

Answer 2

Folklore. Fairyland may be referred to simply as Fairy or Faerie, though that usage is an archaism. It is often the land ruled by the "Queen of Fairy" and thus anything from fairyland is also sometimes described as being from the "Court of the Queen of Elfame" or from the Seelie court in Scottish folklore.