Schwonsburg

Schwonsburg is a medieval fortification situated on a peninsula extending into the Schlei river near Winnemark. The site occupies a strategic location directly across the water from the town of Arnis in Schleswig-Holstein.

The fortification was built around 1415 under King Erik of Pomerania to control the important water routes of the Schlei river. It served as a key defensive position during the early 15th century.

Archaeological investigations in 1903 revealed significant late medieval earthworks, contributing to the understanding of northern German defensive structures.

The site is accessible by taking the Sundsacker ferry from nearby Arnis and offers walking paths along the Schlei riverbank. Visitors should prepare for changeable weather conditions typical of the northern region.

Archaeological excavations in 1903 uncovered significant medieval earthworks at the site, revealing details about northern German defensive construction methods. Although no visible fortification remains today, these discoveries provide important evidence of how such structures were built.

Location: Winnemark

GPS coordinates: 54.62370,9.93308

Latest update: December 14, 2025 18:04