Brionac Plateau is a location in the western Adrestian Empire.
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.
In Imperial Year 1180, the Church of Seiros sends one of its student houses to Brionac Plateau for a training battle against the Church's soldiers.