Allner See, lake in Germany
Allner See is a man-made reservoir near Hennef covering around 10 hectares with depths up to 7 meters. Walking paths circle the water, offering views of grassy banks and the surrounding landscape with trees and natural areas.
The lake was created between 1984 and 1986 during excavation for the A 560 highway construction. After completion, the area underwent restoration from 1986 to around 1990 and became a nature reserve for public recreation and wildlife protection.
The name comes from the nearby Allner district, which was named after Schloss Allner, an old castle in the area. Visitors can see how the protected landscape balances human recreation with care for wildlife habitats.
The site is easily reached on walkways that circle the water and are open from early morning to evening. Parking is available nearby, with paid parking along Dr.-Pagenstecher-Straße, and public transport options are also accessible.
The lake formed from material extracted for highway construction, showing how industrial sites can transform into natural habitats. This transformation happened in less than a decade, demonstrating how quickly nature can recover when given the opportunity.
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