Malak Preslavets Swamp is a protected locality situated 4km north of the village of Malak Preslavets, very close to the Danube. It is about 30 km from Srebarna Reserve and is the feeding base for herons, ibis, fallow deer stag, cormorants and other birds nesting in the Reserve. The lakes and swamps are the habitat and source of important natural and biological resources such as fish, mussels, crabs, reed, healing mud, salt, etc. These resources favour the development of ecological tourism. Malak Preslavets Swamp is one of the biggest water supply zone in Dobrudzha and has significant aesthetic value for the area of Lower Danube with its strange, exotic and extraordinary landscape. The water lily patches and the large concentrations of rare and endangered water birds are little known to the public and are interesting subjects for scientific research and bird watching.
Malak Preslavets Swamp is one of the very few wet areas preserved on the Bulgarian bank of the Danube. It is inhabited by 147 species of birds, of which 82 species nest there.
Among these are the protected species the grey heron, the little egret and the black crowned night heron. Visitors can spot common teals, mallards, tufted ducks, squacco herons, great egrets, mute swans, whiskered terns, common moorhens, Eurasian coots, house martins.
Marsh harriers, common buzzards, Montagu’s harriers, blackbirds, Eurasian coots (its presence is a proof that the swamp water is clean), ferruginous ducks, great crested grebes, garganeys, cormorants, bitterns, and black-necked grebes can seen throughout the year. The swamp’s pride and joy is the enormous wealth of flora on such a small territory. The almost 180 species of higher plants are 4.8% of the higher flora in Bulgaria.
The white water lily (Nymphaea alba) is definitely the most important plant in the group – it is an endangered species in the Bulgarian Red Data Book. This type of lily forms colonies that take up about 46 decares of the swamp's surface, which is the biggest flowering population in Bulgaria. Other plants that can be seen there are the gallium (Galium humiffusum), the thorny bush (Paliurus spina-christi), the raywood ash (Fraxinus oxycarpa), the western waterweed (Elodea nuttallii)- a new species for the flora in Bulgaria. Other species in the area include: Chicory, Rorippa pyrenaica, red clover, duckweed (lemna gibbba), perennial ryegrass (Lolium perenne), Wolffia arrhiza, marsh hedgenettle (Stachys palustris), the common hornwort (Ceratophyllum demersum), white water-buttercup, broadleaf cattail and the woodson.