Tönsberg, Mountain ridge in Teutoburg Forest, Germany

Tönsberg is a long, narrow ridge of Osning sandstone in the Teutoburg Forest, peaking at 333.4 m above sea level. It runs northwest to southeast between Bielefeld and Detmold, with the town of Oerlinghausen wrapped around its northwestern slope. The Hermannsweg long-distance trail follows its crest for about 3.5 km.

The ridge has been occupied since prehistoric times and contained a hillfort called Sachsenlager that functioned as a defense site until the 9th century. The Hünenkapelle, another structure on the ridge, also played a role in this defensive system.

The mountain features on Oerlinghausen's coat of arms as the central peak among three hills. This symbol reflects how the ridge is connected to the town's identity and local pride.

The Hermann's Way hiking trail crosses the ridge and provides several access points to historical sites along the route. Wear sturdy footwear and prepare for weather conditions depending on the season.

The Kumsttonne is the cylindrical stone base of a windmill built in 1753 on the Tönsberg; only this stump survives, and its shape gave it the nickname "Sauerkraut barrel". It appears as an emblem of Oerlinghausen, the town on the ridge's north-western slope.