| Gerdau | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Lower Saxony |
| Subdivision Type3: | Location |
| Subdivision Name3: | Counties of Celle and Uelzen |
| Subdivision Type4: | Reference no. |
| Subdivision Name4: | DE: 5942 |
| Length: | 29.71 km |
| Source1 Location: | In the Lüneburg Heath between Faßberg and Eimke |
| Source1 Elevation: | ca. |
| Mouth Location: | Confluence: Near (Uelzen) with the Stederau to become the Ilmenau |
| Mouth Elevation: | ca. |
| Tributaries Right: | , (for these and others see section tributaries) |
| Tributaries Left: | Schwienau (for these and others see section tributaries) |
| Custom Label: | References |
| Extra: | Hydrologically the main headstream of the Ilmenau |
The Gerdau is a long, left (western) source river for the Ilmenau in the north German state of Lower Saxony.
The river rises in the eastern part of the Lüneburg Heath on the northeastern edge of the Südheide Nature Park. From its source, which is located in the Brambostel Moor Nature Reserve,[1] north of the 94 m high Faßberg, the Gerdau flows by the villages of Eimke and Gerdau towards Uelzen. South of Uelzen it merges with the Stederau to form the Ilmenau.
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