| Ilmenau | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Lower Saxony |
| Subdivision Type3: | Reference no. |
| Subdivision Name3: | DE: 594 |
| Length: | 121.5km (75.5miles) |
| Source1 Location: | source: confluence of the Gerdau and Stederau in (a district of Uelzen) |
| Source1 Elevation: | (Gerdau, Stederau) |
| Mouth Location: | near (a district of Winsen (Luhe)), into the Elbe |
| Basin Size: | 2850km2 |
| Discharge1 Avg: | 17.7m3/s |
| Tributaries Right: | Wipperau, Röbbelbach, Wohbeck, Vierenbach, Dieksbach, Neetze Canal, Neetze, Ilau-Schneegraben |
| Tributaries Left: | Bienenbütteler Mühlenbach, Barnstedt Melbecker Bach, Hasenburger Mühlenbach, Luhe |
| Custom Label: | Navigable |
| Custom Data: | 28.84km (17.92miles) |
Ilmenau is a river south of Hamburg, in Lower Saxony, Germany.
The Ilmenau originates in the Lüneburg Heath, south of Uelzen, at the confluence of the rivers Gerdau and Stederau in, a district of Uelzen. It is a left tributary of the Elbe near Winsen (Luhe).
The Ilmenau is 121km (75miles) long, including its source river Stederau. The largest towns along the Ilmenau are Uelzen and Lüneburg. The city Ilmenau in Thuringia is not along the river Ilmenau but along the river Ilm. The river is navigable from Lüneburg, but almost exclusively used by excursion ships. Above Lüneburg, the river is popular with canoeists.[1]