Wikipedia
Hennef (Sieg)
Hennef (Sieg) is a town in the Rhein-Sieg district of North Rhine-Westphalia, Germany. It is situated on the river Sieg, approx. south-east of Siegburg and east of Bonn. Hennef is the fourth biggest town in the Rhein-Sieg-Kreis (i.e. district). It is the site of the 15th-century castle, Schloss Allner, next to the Allner See.