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.

Ziernsee
Ziernsee
Location	Mecklenburgische Seenplatte, Mecklenburg-Vorpommern
Coordinates	53°12′29″N 13°04′37″E / 53.208192°N 13.076992°E / 53.208192; 13.076992
Primary inflows	River Havel
Primary outflows	River Havel
Basin countries	Germany
Surface area	1.1 square kilometres (0.42 sq mi)
Surface elevation	54.6 metres (179 ft)

The lake has an elevation of 54.6 metres (179 ft) and a surface area of 1.1 square kilometres (0.42 sq mi).

The navigable River Havel flows through the Ziernsee, entering it via a 0.3-kilometre (0.19 mi) long channel from the Ellbogensee to the west, and exiting via a 5.4-kilometre (3.4 mi) channel to the Röblinsee. Navigation is administered as part of the Obere–Havel–Wasserstraße.^[1][2]