Hassel

The Hassel is a river of Saxony-Anhalt, in the East Harz Mountains in Germany. It flows through several municipalities including Stiege and the town of Hasselfelde, located 4 km northwest. Its source is located 4 km south of Stiege. After about 10 kilometres (6 mi) it flows into the Hassel Auxiliary Dam and later into the Rappbode Reservoir, following passage through a pre-dam to prevent the drying out of river valleys, reduce debris, and decrease turbidity.

Source: Wikipedia https://en.wikipedia.org/wiki/Hassel_(river)