Quote Originally Posted by Cleretic View Post
The Aetherfont dungeon is, in Japanese, actually just called the Isle of Haam! So it's the island just north of the main Sharlayan island.
Interestingly, I'm just wrapping up a replay of Endwalker, and in the post-credits conversations at the Rising Stones, Alisaie says that in addition to the main manifestation of the burning skies over Thavnair and Garlemald it also happened in other isolated locations – in particular "an area in the Northern Empty" from which the phenomenon could have spread to Sharlayan if you had taken any longer to stop it.