Situated in the valley of the Koppány stream, the Site consists of fishponds established by damming the watercourse. The large waterbodies, marshlands, meadows and reedbeds support thousands of migrating waterbirds and are considered one of the most significant waterfowl resting and feeding Sites in western Hungary. The area provides excellent nesting habitat for several protected and endangered bird species such as black-crowned night heron (Nycticorax nycticorax), ferruginous duck (Aythya nyroca) and Eurasian bittern (Botaurus stellaris), as well as breeding areas for the strictly protected otter (Lutra lutra). The fishponds are important for trapping sediment, regulating water quality and recharging groundwater. Human activities include intensive fishing, cattle grazing, mowing and farming. There is a permanent bird ringing station for research on migratory species at the Site. The increasing population of mute swan (Cygnus olor) has negatively affected other species.