The Ardennes (also known as Ardennes Forest) is a mountain range in eastern Belgium (eastern Wallonia), northern Luxembourg (the Oesling) and bordering France (Ardennes (department)).
It consist of hills of an altitude up to nearly 700 meters. It has many forests and few people.
The Ardennes are primarily made of slate, and borders in the east at the German Eifel. Important river is the Meuse.