That’s a really good question. Annwn (what I call Faerie) personally, I refer it as another plane or the Otherworld like in many folklore surrounding the British Isles. You could say it’s like another dimension, but dimension sounds like something vary vary far away where as gates to Annwn are assessable and overlay our own world many times at certain points.
I wouldn’t say an alternated universe because alternate universe is using the same people, characters and etc. but in a different setting completely and the characters themselves may be different in personality. When I travel to Annwn I’m still myself just consciously in a different place.
I suggest reading some folklore to help attain a grasp of the realm of fae. You can try genres of echirai and immrama. Echirai are tales involving human travels into supernatural territory an often work within a mythological framework. Immrama tales are monastic in nature but still speak of supernatural beings and an Otherworld. There are endless tales of humans traveling to the Otherworld, Faerie, etc. They all just have different names.
This is only my opinion, I’m sure there are others with different opinions on this subject.
~Fairy Day! The official holiday for fairy collectors, believers, artisans and the young at heart. Celebrated around the world by those who love all things fairy. Mark your calendars & join in the magic! Fairy Day falls on June 24th each year!
~Fairy Day is a holiday sprung from the…