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 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.

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