It is not only recognisable in the terrain as an elongated depression, but also from its geological structure as a basin.
Its average height is about 180 m above sea level (NN), its lowest point is near Wengerohr in the vicinity of Wittlich and on the Lieser, a tributary of the Moselle in Rhineland-Palatinate.
The depression is bounded to the northwest by the Meulenwald forest, to the southeast by the Moselle Hills and to the east by the Kondelwald.
The jointed rocks below the surface hold a larger amount of groundwater than the area around the depression.
Due to its sheltered location, tobacco is grown in the valley.