the total area mainland and sea under permanent protection in croatia steadily increased over the period table and map by the end of there were nature sites protected in nine categories table the national protected areas feature internationally recognized protected areas including five ramsar sites cma mlaka lonjsko polje and mokro polje kopacki rit neretva river delta and vransko lake two biosphere reserves muradravadanube regional park and kopacki rit nature park and a world heritage site plitvice lakes national park