The Dutzower See is part of the Schaalsee and forms the northern bay. The nature reserve Niendorfer-Bernstorfer Binnensee is a 567 hectare nature reserve in Mecklenburg-Western Pomerania east of Kittlitz (Schleswig-Holstein). The area is divided from north to south into the Dutzower See, the forest area Dohlen and the Bernstorfer Binnensee with the islands of Großer and Kleiner Werder. The protection goal is to maintain a lake with little disruption with adjacent bank areas and moored swamp forests. The nature reserve is located in the Schaalsee biosphere reserve.