The Stemberg is one of the local mountains of Holzhausen-Externsteine.
It is a 402-metre-high mountain in the southwest of the Teutoburg Forest.
The slopes of the Stemberg were used as hut forests or hudestücke. Around 1880, the spruce trees, some of which still exist today, were sown.
According to tradition, mass baptisms of Saxons were carried out at the springs of the Stemberg by the monks of the Abdinghof monastery in Paderborn in the 8th century.