| Ziernsee | |
| Location: | Mecklenburgische Seenplatte, Mecklenburg-Vorpommern |
| Coords: | 53.2082°N 13.077°W |
| Inflow: | River Havel |
| Outflow: | River Havel |
| Basin Countries: | Germany |
| Pushpin Map: | Germany |
| Pushpin Map Alt: | Location of Ziernsee in Germany. |
Ziernsee is a lake in the Mecklenburg Lake District, in Germany. Whilst most of the lake is in the district of Mecklenburgische Seenplatte (municipality Priepert) in the state of Mecklenburg-Vorpommern, a portion of its southern shore is in the state of Brandenburg.
The lake has an elevation of and a surface area of .
The navigable River Havel flows through the Ziernsee, entering it via a 0.3km (00.2miles) long channel from the Ellbogensee to the west, and exiting via a 5.4km (03.4miles) channel to the Röblinsee. Navigation is administered as part of the Obere–Havel–Wasserstraße.[1] [2]