| Lonau | |
|---|---|
| Location | north of Herzberg am Harz in Osterode am Harz in Lower Saxony, Germany |
| Length | ca. 3.5 km |
| Confluence | of the Großer and Kleiner Lonau in Lonau |
| Source height | unter 340 m |
| Mouth | Sieber |
| Mouth height | unter 260 m |
| Descent | ca. 80 m |
| Basin | Sieber → Oder → Rhume → Leine → Aller → Weser |
| Catchment | ca. 14 km² |
| Small towns | Herzberg am Harz |
The Lonau is a roughly 3.5 km long (from Lonau) tributary of the Sieber. It starts in Lonau, formed by the confluence of the Große and Kleine Lonau. It then flows in a southerly (intermittently in a south-southwesterly) direction to Herzberg am Harz, where it discharges into the Sieber after the Lonau Waterfall.