Most of the territory is part of Loire-Atlantique, but several villages in Ille-et-Vilaine are usually included in the Pays de la Mée.
Moreover, its limits are not very clear; for example, Candé, a small town in Anjou, was named Candé-en-la-Mée during the Middle Ages.
The landscape of the Pays de la Mée is hilly because it is on the eastern side of the Armorican Massif.
The ground is mostly made of schist and contains small amounts of iron ore, which was particularly exploited during the 19th century.
It disappeared as an administrative unit around 1270, when the counties of Nantes and Rennes merged into one single state.