Lonau (river)

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
51°41′24″N 10°21′33″E / 51.690028°N 10.359028°ECoordinates: 51°41′24″N 10°21′33″E / 51.690028°N 10.359028°E
Source height unter 340 m
Mouth Sieber
51°39′43″N 10°20′50″E / 51.661806°N 10.34722°E
Mouth height unter 260 m
Descent ca. 80 m
Basin SieberOderRhume → Leine → AllerWeser
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.