Burg Vehlefanz, Medieval castle ruins in Vehlefanz, Germany

Burg Vehlefanz is a ruined water castle in Vehlefanz, about 15 km northwest of Berlin. Only a brick tower stump and a small piece of wall remain on a tower mound (Motte) over 7 m high, with a base diameter of 62 m and a plateau of 39 m. The roughly 7 m wide moat was almost completely filled in 1897.

The site began as a tower motte castle of the 14th century, built by the von Redern family as a replacement for an older, uninhabitable hilltop stronghold. In 1412, Frederick VI of Hohenzollern defeated the Pomeranian dukes Otto and Casimir nearby. In 1786 a new administrative building was erected, likely reusing stones from the water castle; in 1812 Napoleon briefly used it as headquarters.

The name Vehlefanz comes from Slavic words meaning 'large' and 'beard', reflecting the linguistic heritage of the people who inhabited this region long before the fortress was built. This naming reveals how local speech patterns connected to the landscape and its features.

The site is easily accessible and walkable, with the ruins open and visitable at any time. The elevated mound offers good views across the surrounding area and visits are best enjoyed during dry weather.

The 1812 headquarters was not in the medieval ruin but in the new Amtshaus built in 1786, which likely reused stones from the old water castle. That administrative building has since disappeared, leaving only the tower mound and a brick fragment.