Oder

Southwest Harz with the Oder
Location
Country	Germany
State	East Lower Saxony
Physical characteristics

Source
• location	near Oderbrück [de] (part of Sankt Andreasberg) in the Harz Mountains
• elevation	ca. 810 m above sea level (NN)

Mouth
• location	near Katlenburg into the Rhume
• coordinates	51°40′44″N 10°6′11.05″E / 51.67889°N 10.1030694°E / 51.67889; 10.1030694
• elevation	131 m above sea level (NN)
Length	56.1 km (34.9 mi)^[1]
Basin size	385 km² (149 sq mi)^[1]
Basin features
Progression	Rhume→ Leine→ Aller→ Weser→ North Sea
Landmarks	Small towns: Bad Lauterberg
Tributaries
• left	Pöhlder Beber
• right	Sperrlutter, Lutter, Sieber
Waterbodies	Reservoirs: Oderteich, Oder Reservoir

The Oder is a 56-kilometre-long (35 mi) river in Lower Saxony, Germany, and a right tributary of the Rhume. Its source is in the Harz mountains, near Sankt Andreasberg. It flows southwest through Bad Lauterberg, Pöhlde and Hattorf am Harz. The Oder flows into the Rhume in Katlenburg-Lindau.

Course

The Oder rises in the district of Goslar in the heart of the Harz Mountains. Its source is located in the southern part of the Brockenfeld about 1.3 km (0.81 mi) north of the Achtermannshöhe. The river's source is called the Odersprung or "Oder Leap."

On the Brockenfeld, which is close to the Odersprung, the rivers Abbe, Große Bode, Ecker and Kalte Bode also have their respective origins. On its perimeter is the ancient Dreieckiger Pfahl boundary stone.

After the Oder passed under the B 4 federal highway in Oderbrück [de] in east-west direction, it is impounded for the first time west of the village in the Oderteich, where it bends to the south. A few kilometres further downstream, the river is impounded for the second time not far southwest of Oder Valley Sawmill (Odertaler Sägemühle) by the barrage of the Oder Dam. Thereafter the river flows through Bad Lauterberg and leaves the Harz.

In Bad Lauterberg the Oder swings west, running through Pöhlde and Hattorf am Harz, passing north of the Rotenberg ridge, and reaches Wulften. In Hattorf it collects the Sieber river coming from the northeast, before emptying into the Rhume (a tributary of the Leine) in Katlenburg from the east.

Between Scharzfeld and Katlenburg the Oder flows through the nature reserve of Oderaue.