In the south east the Kleiner Deister is separated from the northern foothills of the Osterwald by a valley through which run both the Gehlenbach stream and the L 422 from Eldagsen to Coppenbrügge.
At once time the old Wolfsbuche stood on the saddle between the Kleiner Deister and the Nesselberg and therefore between the Wolfsköpfe in the northeast and the Grasberg in the southwest; this was also the source of the Schwarze Bach, a tributary of the Gehlenbach.
The Kleiner Deister ist almost entirely surrounded by a 16.3 km long and 2 m high sandstone wall which, in the south, runs over the crest of the Nesselberg.
The side of the Kleiner Deister that descends southwest to the Nesselberg is made of stratified sandstones, siltstones and clays, with deposits of anthracite in places.
In addition to Saupark Springe and the Springe Bison Enclosure with their animals and plants, demonstration areas for deer feeding and Stone Age barrows; other points of interest include old sandstone quarries on the Nesselberg, the ruins of the medieval Hallermund Castle on the Hallermundskopf and the remains of an Early Middle Ages circular rampart, the Kukesburg, near Altenhagen.