With an area of 3.95 km², the Carwitzer See is the largest lake in the Feldberg lake landscape. Its central part, about 2.6 x 2.3 kilometers, is relatively flat and has nine islands (the island names from west to east: Jägerwerder, Gänsewerder, Bohnenwerder, Steinwerder, Bollenwerder, Kohlwerder, Elswerder and two islands off Conow). To the north is the approximately 4.2 kilometers long and over 40 meters deep Zansen. The Carwitzer See and the Zansen are considered in some sources as a limnological unit. In the south there is a bay that protrudes like a hook to the east, the so-called southern depth (30 m deep). The shorter Fallada and fishing bays protrude to the west. The village of Carwitz lies on a narrow land bridge that separates the Carwitzer See and the Zansen from the 6.5 kilometer long Schmalen Luzin in the northwest. From the Schmalen Luzin water is supplied to the Carwitzer See via the "Bäk". The main runoff of the Carwitzer See is via the so-called "neck" to the southwestern, 2 kilometer long Dreetzsee. From here the water flows underground through ribbon springs to the Krüselinsee and then over the Küstriner Bach in the direction of Lychener Seen and on to the Havel.
Source: Wikipedia