The Bredenbek and Lottbek flow together here and are dammed up at this point. The result is the Hörndiek, a small, idyllic reservoir in the Hamburg district of Ohlstedt. You can walk around it completely in about 30 minutes. In the winter months it is suitable for ice skaters and hockey players. It is better to avoid the eastern part with the lock on the ice. A beautiful piece of nature in the northeast of Hamburg. It's worth going around the small reservoir, enjoying the beautiful views and forgetting about everyday life.