The Gllia Region (analogue to the real-world Gaul region) is a land area located near the center of the Eresian continent, east of the Ispani peninsula and south of Britai. It contains the locations of Promalock, Esteria, Baldeux, and the titular Ys.

The northern lands of the Gllia Region were explored by adventurer Adol Christin during the events of Ys I: Ancient Ys Vanished and Ys II: Ancient Ys Vanished – The Final Chapter.

In Ys IX: Monstrum Nox, Adol explores a part of the region to the northeast of Esteria, centered on the large city of Baldeux.

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