The Brionac Plateau is a location in the western Adrestian Empire.
The Brionac Plateau is located near the border with the Holy Kingdom of Faerghus, and lies adjacent to the Viscounty of Nuvelle, the territory of Arundel, and the Western Church. It is a lush, temperate area. A number of fortifications have been built around the plateau.
- The Brionac Plateau's name is a possible reference to the game Xenoblade Chronicles 2, as it shares its name with the Brionac, a terrorist organization in that game which opposes the rule of Mor Ardain.