Pond Dvorina was declared a protected 1987th as a special ornithological reserve. Surface is about 726 hectares and extends along the Sava River in the length of 6 km. Borders reserves go on the Sava River from 343rd to 334th miles (point 90.6), followed by a causeway to klakarskog cemeteries and a vertical line to the starting point. Includes pond Dvorine, smaller ponds, meadows and pastures with ponds and floodplain forest, oak (cut down). It is especially important as nesting, feeding and wintering birds many. Here we find the white and black stork, black coots, great crested grebe, Whiskered Tern, wild duck, ferruginous duck, vivka ... Also this area is important mrijestililište Sava numerous fish and amphibian (red bellied toad, newt Danube). During the research world of amphibians and birds Dvorine ponds.