
1) Castle in Lower Saxony 2) Lowland castle
Found on
https://www.crosswordclues.com/clue/bunkenburg

Bunkenburg was a castle built during the 13th and 14th centuries in the shape of a circular fort located on the banks of the River Aller opposite Ahlden in north Germany. Only a section of the rampart, roughly 60 metres long and 3 metres high, exists today. The name of the castle is probably derived from the material, bog iron, used for its constr...
Found on
http://en.wikipedia.org/wiki/Bunkenburg
No exact match found.