The Flechtinger Höhenzug is about 20 by 20 kilometers in size. It is bordered in the west by the Aller, in the north by the Spetze, a right tributary of the Aller, in the northeast by the valley of the Ohre, in which the Mittellandkanal also runs, and in the south by the Beber, a tributary of the Ohre.
One of the highest elevations of the Flechtinger Höhenzug is the Butterberg near the village of Ivenrode at 176 m above sea level.