Hennef is a town in the Rhein-Sieg district of North Rhine-Westphalia, Germany. It is situated on the river Sieg, approx. 7 kilometres south-east of Siegburg and 15 km east of Bonn. Hennef is the fourth biggest town in the Rhein-Sieg-Kreis . It is the site of the 15th-century castle, Schloss Allner, next to the Allner See.
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