Sieber (river)

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Harz SW.png
The southwestern Harz with the Sieber river
Location Lower Saxony,  Germany
Length 35 km
Source on the Bruchberg in the Harz
Source height ca. 800 m above sea level (NN)
Mouth In Hattorf into the Oder (Harz)
51°38′43″N 10°13′49″E / 51.645167°N 10.230333°E / 51.645167; 10.230333
Mouth height 174 m above sea level (NN)
Descent ca. 630 mdep1
Basin Weser
Progression Oder (Harz) → Rhume → Leine → Aller → Weser → North Sea
Catchment 141 km²
Right tributaries Kulmke, Lonau, Große Steinau, Kleine Steinau
Small towns Herzberg

The Sieber is a 35 km long, right hand tributary of the Oder in the Harz mountains of Germany.

It rises at 760 m on the Bruchberg massif and flows through Herzberg before discharging at Hattorf into the Oder which, in turn, flows into the Rhume. Its tributaries include the Kulmke, Lonau and Goldenke.

In February 1910, as part of his hydrological research into the Rhumequelle, Karl Thürnau dyed the Sieber tributary of the Eichelbach (Herzberg/Harz) with six kilogrammes of fluorescein. Three days later, weakly dyed water appeared in the main source of the Rhumequelle. This was confirmed in 1980 by dye tracing carried out by the Geological Survey of Lower Saxony (Niedersächsischen Landesamtes für Bodenforschung). This also indicated links between the Rhumequelle and the Sieber near Hörden and the Oder near Scharzfeld.

The construction of a dam was planned but never realised. As a result the Sieber valley is the only unregulated river valley in the West Harz. The upper Sieber valley is out-of-bounds to vehicle traffic from the Forsthaus Königshof and lies partly within the Harz National Park – the road leads to the B 242 federal road northwest of Sonnenberg.

The river gives its name to the village of Sieber in the Sieber valley.