The Site consists of an area of former fishponds which were originally used for carp breeding and are now designed for the biological treatment of wastewater from Munich, and one of the biggest reservoirs in Bavaria which was formed by the damming of the Isar River. The water in the complex is a mixture of river water and wastewater. The Site is surrounded by farmland; the banks of the reservoir are mostly devoid of vegetation, although part of the southern shoreline features a succession from reedbeds to woodland. It supports breeding birds and is internationally important for wintering and staging waterbirds: it is one of the three largest European moulting sites from June to August, including for the globally vulnerable common pochard (Aythya ferina), and is one of the most important wintering areas for waterfowl in Southern Germany and extremely important as a breeding area for rare water and reed birds. The Site supports more than 1% of the global population of the tufted duck (Aythya fuligula) and the red-crested pochard (Netta rufina). Human activities include seasonal hunting and fishing. Long-term monitoring is carried out.