Nature Park includes the largest natural lake in Croatia which extends over 57 km2. Northwest part of the lake has been declared a special ornithological reserve inhabited occasionally with over 230 species of birds.

Of these 102 species are nesting here _ .. On the wintering more than 100,000 birds and water birds regulary visits the park.
For cyclists and hikers there is a 40 km trail around the lake. The lake is located near the sea (only two kilometers) , and is connected with the sea by the small channel. Thus avoiding the frequent flooding of the surrounding fields during heavy rains. The lake is famous for its sport fishing throughout the year because it is rich in freshwater fish.