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Lake near the village of Hennef surrounded by meadows.
The Allner See is an artificial lake. Directly to the north is the 15th century castle Schloss Allner. Starting in 1979 excavations to obtain sand and gravel for the construction of Highway 560 created a pit some six meters deep. In 1990 trees were planted and landscaping was finished just as the highway was completed, producing the lake in its current form. The lake is popular with anglers, but swimming and water sports are prohibited. The lake is a good place for spotting Common Kingfisher.
In the Allner district, there are parking spaces right next to the motorway. You just have to go through the underpass and you're already there. Click on the P in the map for directions to the parking. A circular walk around the lake is possible and about 2 km.
Photo Allner See by Wolkenkratzer, CC BY-SA 3.0, https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons.