| Delvenau | |
| Mouth Location: | Elbe–Lübeck Canal |
| Mouth Coordinates: | 53.3739°N 10.5808°W |
| Progression: | Elbe–Lübeck Canal→ |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | States |
| Subdivision Name2: | Schleswig-Holstein and Mecklenburg-Vorpommern |
Delvenau (incorrectly known today as: Stecknitz) is a 50adj=midNaNadj=mid river in Herzogtum Lauenburg in Schleswig-Holstein, Germany.[1] It begins in Büchen, flows to the Elbe–Lübeck Canal near its confluence with the Elbe in Lauenburg. The lower section between Bröthen and Lauenburg forms the border between Schleswig-Holstein and Mecklenburg-Vorpommern.
The name Delvenau originates from the Middle Low German word delf meaning trench.