Ruppiner See is a lake in Ostprignitz-Ruppin, Brandenburg, Germany. At an elevation of 36.5 m, its surface area is 8.25 km2. It is believed to have formed as a glacial tunnel valley.

The Rhin is a 133.3-kilometre long river in Brandenburg, Germany, right tributary to the river Havel. It flows through the city Neuruppin and several lakes. A few kilometres downstream from Rhinow it