Bardenburg, Medieval hillfort in Georgsmarienhütte, Germany.

Bardenburg is an early medieval hillfort on the Reremberg at the northern edge of the Teutoburg Forest, south of Georgsmarienhütte. The roughly oval rampart is about 260 m long and 100 m wide, with a cross-wall dividing a smaller main castle in the east from a larger outer bailey in the west. The earthworks remain about 10 m wide and 2 m high.

The Bardenburg was first mentioned around 1184, when Count Simon I of Tecklenburg transferred it to Oesede Monastery, founded in 1170. Its two-part layout points to the late Early Middle Ages or Carolingian period. Excavations in 1891, 1910 and 1984/85 produced no dating finds.

The name Sachsenwall, also used for the site, links the rampart to the Saxons; the German Wall means rampart. The fortification stands on the Reremberg at the northern edge of the Teutoburg Forest, and its two-part layout of main castle and outer bailey can still be traced in the terrain.

Information panels on-site offer insights into the fortification's history and structure, with additional details available through the Georgsmarienhütte Navigator website. The elevated location provides good visibility over the grounds and surrounding landscape.

The name Sachsenwall, also used for the site, is not explained by any excavated find: none of the digs in 1891, 1910 and 1984/85 produced dating artefacts. The rampart seen today is about 10 m wide and 2 m high, and a breastwork probably stood on its crown.