Ziernsee is a lake

Lake

A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and are larger and deeper than ponds. Lakes can be contrasted with rivers or streams,...

 in the Mecklenburg Lake District

Mecklenburg Lake District

The Mecklenburg Lake District is the largest coherent lakes and canals area in Germany. It is situated in southern Mecklenburg-Vorpommern, extending somewhat into the north of Brandenburg, and sometimes called "the land of the thousand lakes".The Seenplatte includes Müritz National Park, which...

, in Germany

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

. Whilst most of the lake is in the district of Mecklenburgische Seenplatte

Mecklenburgische Seenplatte (district)

Mecklenburgische Seenplatte is a district in the southeast of Mecklenburg-Vorpommern, Germany. It is bounded by the districts Ludwigslust-Parchim, Rostock , Vorpommern-Rügen, Vorpommern-Greifswald, and the state Brandenburg to the south...

 (municipality Priepert

Priepert

Priepert is a municipality in the district Mecklenburgische Seenplatte, in Mecklenburg-Vorpommern, Germany. It is situated on the River Havel between the lakes of Großer Priepertsee and Ellbogensee....

) in the state of Mecklenburg-Vorpommern, a portion of its southern shore is in the state of Brandenburg

Brandenburg

Brandenburg is one of the sixteen federal-states of Germany. It lies in the east of the country and is one of the new federal states that were re-created in 1990 upon the reunification of the former West Germany and East Germany. The capital is Potsdam...

.

The lake has an elevation of 54.6 metres (179.1 ft) and a surface area of 1.1 square kilometre (0.424712374451789 sq mi).

The navigable River Havel

Havel

The Havel is a river in north-eastern Germany, flowing through the German states of Mecklenburg-Vorpommern, Brandenburg, Berlin and Saxony-Anhalt. It is a right tributary of the Elbe river and in length...

 flows through the Ziernsee, entering it via a 0.3 kilometre (0.186411820994942 mi) long channel from the Ellbogensee

Ellbogensee

Ellbogensee is a lake in the Mecklenburg Lake District, in Germany. Whilst most of the lake is in the district of Mecklenburgische Seenplatte in the state of Mecklenburg-Vorpommern, a portion of its southern shore is in the state of Brandenburg...

 to the west, and exiting via a 5.4 kilometres (3.4 mi) channel to the Röblinsee

Röblinsee

Röblinsee is a lake in the Mecklenburg Lake District, in Germany. It is situated in the district of Oberhavel in the state of Brandenburg, and lies immediately to the west of the town of Fürstenberg. The lake has an east-west orientation, and is about long and up to wide.The navigable River Havel...

. Navigation is administered as part of the Obere–Havel–Wasserstraße.