Sharlayan

Sharlayan is an inaccessible region of Hydaelyn in Final Fantasy XIV. They exist to the north of Aldenard, beyond the map of Eorzea given to players. The Circle of Knowing hales from there, and Louisoix was the last to come to Eorzea to offer assistance. Their patron deity is Thaliak the Scholar.

Final Fantasy XIV: A Realm Reborn
Sharlayan has been mentioned often by the Circle of Knowing, so it is among the myriad nations Square-Enix appears to yet have interest in. There are two pieces of concept art depicting ruins in a snowy or crystaline landscape. As Sharlayan is to the north, one of them may be a depiction.