The Site is an artificially regulated lake supporting an extensive area of freshwater fen and marsh characterized by reedbeds, wet meadows, patches of willow, and small open water bodies in a former river branch of the Danube floodplain. It hosts a regionally large population of a vulnerable indigenous fish species, the European mudminnow (Umbra krameri). Moreover, it is an important wintering and breeding ground for large numbers of herons and waterfowl such as the ferruginous duck (Aythya nyroca) and moustached warbler (Acrocephalus melanopogon). The Site plays an important role in water retention, groundwater recharge and discharge, and climate modification at local level. Human activities include reed harvesting, mowing, forestry and agriculture. A habitat restoration project implemented from 2010 to 2013 excavated a section in the middle of the lake to create a new 48 ha open water body for birds and fish. Potential threats to the Site’s ecological character are overfishing, vegetation succession and overgrowth caused by drainage, decrease of groundwater level, expansion of exotic species and eutrophication.