Armorican Massif
The Armorican Massif reaches its maximum elevation outside of Brittany, in neighbouring Mayenne, at 417 m, and slopes towards the west before straightening on its western extremity, with the Montagnes Noires and the Monts d'Arrée. The highest hill in Brittany is the "Roc'h Ruz" in the Monts d'Arrée, at . It is closely followed by several neighbouring hills culminating at around 384 m above sea level.