The world of Hydaelyn contains a Region known as Eorzea, which is made up of the island of Vylbrand where Limsa Lominsa and O'Ghomoro are located, and the landmass of Aldenard where Ul'dah, Gridania, Ishgard, Sharlayan, and Ala Mhigo are located.

The other known land within Hydaelyn is all the land that stretches eastward, which as far as we know is all under the rule of the Garlean Empire which is based in a city called Garlemaid, whose current location is unknown.