Łężczok nature reserve (known as Łężczak until 2015) is a water nature reserve located in the Silesian Voivodeship, Racibórz County, situated between Racibórz, Nędza, Zawada Książęca, and Babice. It is part of the Rudy Landscape Park. The reserve is home to a rich variety of fauna and flora, including over half of the bird species found in Poland. Two hiking trails and one cycling route pass through the reserve. It has held the status of a nature reserve since 23 January 1957.
Initially, the reserve covered an area of 396.21 hectares; however, it has been expanded several times, most recently in 2015, to its current size of 477.38 hectares.
The reserve is located within the jurisdiction of the . It is overseen by the Regional Nature Conservation Officer in Katowice. While the reserve does not have a formal protection plan, conservation tasks are in place that ensure the area is subject to active protection.
Geography The Łężczok nature reserve is located in the , in the southwestern part of the Silesian Voivodeship, Racibórz County. Its area extends from Racibórz, specifically the district of , through Nędza and Babice, to Zawada Książęca. The reserve's eastern boundary is marked by .
It is one of the largest nature reserves in the Silesian Voivodeship, currently covering 477.38 hectares. Before its expansion in 2015, it occupied 408.9 hectares, of which 245 hectares were ponds, 144 hectares forests, 7 hectares meadows, and the remainder consisted of roads and dikes. The reserve borders grasslands and arable fields and forms part of the Rudy Landscape Park.
Within the reserve are eight ponds: Ligotniak, Brzeziniak, Babiczak, Grabowiec, Tatusiak, Markowiak, Salm Duży, and Salm Mały. These ponds have existed since the 13th century and are used for extensive fish farming.
Origin of the name The name of the reserve comes from the Old Polish language, derived from the words łęg and łęgi, which referred to wetland areas covered by forests or meadows on marshes. Consequently, the nearby village, located to the northwest of the reserve, is also named Łęg, and the stream flowing through the reserve is called .
History of the area and its protection
The oldest historical references to this area date back to the 13th century, indicating that local inhabitants practiced fish farming there. The sources reveal that, in addition to fish farming by noble estates, some ponds were also used by peasant farms for this purpose. In the 14th century, these lands came under the ownership of the Cistercians from Rudy. The Cistercians utilized the oxbow lakes of the Oder river to create an artificial system of reservoirs by constructing sluices and embankments. Besides creating new reservoirs, they regulated the existing ones.
In 1683, King John III Sobieski passed along the road between the ponds on his way to the Battle of Vienna and possibly planted several oak trees there. To commemorate this event, the , marked in red, was established through Łężczok. In 1783, the Cistercians built a hunting lodge along the road traversing the forest. In 1810, following the dissolution of the Cistercian Order, their estate came under the ownership of Landgrave Victor Amadeus of Hesse-Rotenburg and subsequently passed to the Prussian princes Hohenlohe-Waldenburg-Schillingsfürst, particularly to Viktor I, nephew of Victor Amadeus’ wife. The new owners altered the ponds and forests by introducing monoculture spruce plantations and established pheasant breeding for hunting purposes. During the Hohenlohe family's ownership, the area was studied by researchers such as the German physician and naturalist Julius Roger and the naturalist . In 1906 and 1910, German Emperor Wilhelm II, accompanied by Duke Victor III of Racibórz, participated in hunts in the area.
In 1922, the area's significant natural values led to its inclusion in the registry of natural monuments. In 1945, under the Polish Committee of National Liberation decree, the area became state property. On 23 January 1957, by order of the Minister of Forestry and the Wood Industry, the area was designated as the Łężczak nature reserve. In 1993, the reserve became part of the Rudy Landscape Park. In 2009, due to poor conditions, particularly of the embankments, the reserve was temporarily closed, and the ponds were drained. With EU funding amounting to 5 million PLN, the area underwent modernization, including embankment repairs and the construction of artificial islands on the ponds. The reserve was reopened in December 2012. Since 16 October 2015, following an ordinance by the Regional Director of Environmental Protection in Katowice, the reserve has been officially named Łężczok.
Flora
The forested areas of the reserve are dominated by old-growth stands with a two-story structure, giving it a specific character reminiscent of the interior of a primeval forest. 64% of the forests in the reserve consist of stands over 100 years old. Among them, noteworthy are specimens of pedunculate oaks of considerable size, estimated to be between 330 and 400 years old.
Also notable are the embankments planted with various tree species, forming linden, oak, hornbeam, and field alleys. In the reserve, the largest trees are beeches, lindens, and oaks. The trees growing on the embankments shape the macroclimate of the reserve, as they serve as windbreaks. The gaps in the alleys are filled with shrubs, and the entire arrangement creates an ecological niche for many species of plants, fungi, and animals. Its location near the Moravian Gate, geographical and climatic factors, and past economic activities have made these tree-lined embankments one of the unique features of the reserve.
The diversity of habitats in the reserve is reflected in the richness of plant communities and species. The vegetation is represented by more than 40 plant communities, including five forest communities. The first is the subcontinental oak-hornbeam forest, located in the western part of the reserve. This community includes trees such as oaks, hornbeams, small-leaved lindens, larches, eastern white pines, and birches. This part of the forest also features lush groundcover. The next forest community is the elm riparian forest, where trees such as ashes, pedunculate oaks, maples, and occasionally elms and hornbeams can be found. This is one of the best-preserved forest communities in the reserve and the entire Oder valley. The alder-ash riparian forest is another community in the reserve, dominated by common alders, occasionally accompanied by ashes, pedunculate oaks, and spruces. This community is found near the eastern boundary of the reserve. Another community is the currant alder carr, dominated by common alders. This carr is located to the northeast of the Salm Mały and Salm Duży ponds. The final community is the acidophilic oak forest, where species such as pedunculate oaks and silver birches are present, with Scots pines appearing occasionally. This community has the poorest and most acidic soils in the reserve.
Among the numerous non-forest communities are aquatic vegetation (e.g., the water caltrop and communities), shoreline vegetation (e.g., , , , and ), and meadow communities (e.g. ).
In the western part of the reserve, spring brings blossoms of snowdrops, alpine squills, wood anemones, spring vetchlings, early dog-violets, yellow archangels, wild garlic, Corydalis cava, fumeworts, sweet woodruffs, and bugles. In the eastern part, shrubs such as common heather, European blueberry, and lesser periwinkle can be found. Herbs are also present in these areas. Near the edges of the ponds, where the ground is slightly waterlogged, as well as in marshy areas, species such as common skullcap, purple loosestrife, mugwort, black-bindweed, yellow flag, greater spearwort, and Carex grow. Peatlands can be observed in the reserve, forming in areas where ponds have become significantly shallower.
The ponds are overgrown with plants that have submerged rhizomes and roots, including common reed, bulrush, sweet flag, simplestem bur-reed, American waterweed, and arrowhead. Another group consists of plants rooted to the bottoms of water bodies with leaves and flowers floating on the water’s surface, such as longroot smartweed, white waterlily, yellow water-lily, bladderwort, and the tertiary relict water caltrop. Additionally, freely floating plants such as floating fern, European frog-bit, and duckweed can be observed. The last group includes underwater plants, such as hornwort, soft hornwort, Eurasian watermilfoil, and American waterweed.
The meadows in Łężczok host species such as broad-leaved marsh orchid, autumn crocus, cock's-foot, hornworts, soft-grass, clover, bird’s-foot trefoil, Vicia, chrysanthemum, lady’s mantle, bistort, and true forget-me-not.
The flora of the reserve comprises 530 species of vascular plants, 22 of which are protected. These include white waterlily, yellow water-lily, floating fern, and the water caltrop, which is nationally endangered. In the forest groundcover, notable species include snowdrop and alpine squill. Among protected plants, there is a rare orchid species . Protected fungi in the reserve include parasitic bolete, giant polypore, hen-of-the-woods, and common stinkhorn. Other protected plants include mezereon, common ivy, and dark-red helleborine.
A natural monument in the reserve, known as Sobieski Oak, is a pedunculate oak with a DBH of 690 cm. The insectivorous waterwheel plant was once present in the reserve, and round-leaved sundew can still be found in the peatlands.
Fauna
The reserve is home to 51% of bird species found in Poland, which amounts to over 190 species, including 115 nesting species. The remaining species use the area for foraging and resting during migrations. Łężczok is an excellent site for wildlife observation, particularly for ornithologists. In terms of bird species diversity, the reserve ranks second in Poland after the . Due to the numerous ponds, many water and marsh birds inhabit the area.
During the breeding season, species such as grebes (great crested and black-necked grebes), Eurasian bitterns, cormorants, greylag geese, and various Anatidae (gadwalls, garganeys, northern shovelers, common pochards, tufted ducks, and red-crested pochards) can be found there. The red-crested pochard regularly resides in the reserve, making it one of only three such locations in Poland. Rare species like the ferruginous duck, river warbler, collared flycatcher, purple heron, squacco heron, Eurasian spoonbill, barnacle goose, red-breasted goose, pied avocet, whiskered tern, and black-winged kite (unique in Poland) have also been observed.
Apart from water and marsh birds, the reserve is home to other bird species, including woodpeckers and birds of prey such as the common buzzard, Eurasian goshawk, common kestrel, Eurasian sparrowhawk, western marsh harrier, European honey buzzard, and black kite. Outside the breeding season, species such as the white-tailed eagle, lesser spotted eagle, osprey, black stork, grey heron, mute swan, and black-headed gull can be spotted.
In addition to its abundant birdlife, the reserve is inhabited by numerous amphibians and reptiles. Among the amphibians are the European fire-bellied toad, common spadefoot, newts, common and European green toads, and the European tree frog. Reptiles include the sand lizard, viviparous lizard, adder, and grass snake.
The reserve also hosts many insect species, particularly Odonata, bumblebees, and Lepidoptera.
The last group of animals in the reserve includes mammals, represented by 23 species. Noteworthy species include the hedgehog, common shrew, bats, muskrat, and predators such as the fox, beech marten, European polecat, weasel, and Eurasian badger.