WRW2018 – 4th International Conference Water resources and wetlands which will be held on 5-9 September 2018 at the Hotel Delta in Tulcea (Romania). Conference it is organized by the Romanian Limnogeographical Association (RLA) in collaboration with the German Limnological Society (GLS), Polish Limnological Society (PLS), Danube Delta National Institute Tulcea (DDNI) and the Danube Delta Biosphere Reserve Authority (DDBRA).