Große Lonau
| Location | Northeast of Lonau in Osterode am Harz district in Lower Saxony,  Germany |
|---|---|
| Length | 6 km |
| Source | South of the Hanskühnenburg 51°43′29″N 10°24′23″E / 51.72472°N 10.40639°ECoordinates: 51°43′29″N 10°24′23″E / 51.72472°N 10.40639°E |
| Source height | 730 m |
| Confluence | with the Kleine Lonau to form the Lonau 51°41′24″N 10°21′33″E / 51.690028°N 10.359028°E |
| Mouth height | 339 m |
| Descent | 391 m |
| Basin | Weser |
| Progression | Lonau → Sieber → Oder → Rhume → Leine → Aller → Weser |
| Catchment | 7.2 km² |
| Left tributaries | Bornwinkel |
The Große Lonau is the left headstream of the River Lonau in Lower Saxony, Germany.
Course
It rises at an elevation of 730 m in the vicinity of the Hanskühnenburg on the ridge of Auf dem Acker. Then it flows mostly in a south-southwest direction to Lonau, where it merges with the Kleine Lonau to form the Lonau. The Große Lonau is 6 km long, 1.8 km longer than the Kleine Lonau.