Łęgi Odrzańskie: Mapped Boundaries and Protected Riverine Landscapes in Lower Silesian Voivodeship

Until 1753, the entire Oder valley in this part of Silesia was covered by extensive marshes and bogs, broken only by a few small fishing villages. In the eighteenth century, large-scale drainage works were ordered, which produced roughly 225,690 morgs of new farmland and brought settlers from different parts of the country to cultivate the reclaimed land. As a result of this drainage, most of the original wetland landscape disappeared, leaving only the narrow ribbon of riparian forests and wet habitats that follow the active Oder channel and its floodplain.

Politically the area was part of the Kingdom of Prussia and later of Germany until 1945, when it was incorporated into Poland after the end of the Second World War. The surviving floodplain fragments remained largely intact and later became the basis for modern conservation designations. In 2007 the territory received its first Natura 2000 recognition as a bird protection area (PLB020008), followed in 2009 by parallel designation as a habitat protection area (PLH020018), and in November 2019 the two sites were formally merged into the single Łęgi Odrzańskie site PLC020002, with a further boundary adjustment to the bird component in February 2022.

The landscape of Łęgi Odrzańskie is shaped almost entirely by the middle course of the Oder River and the geological history of its valley. The site stretches 101 kilometers from Brzeg Dolny in the south to Głogów in the north, traversing three classic ice-age and post-glacial morphological units: the Pradolina Wrocławska, the Obniżenie Ścinawskie and the Pradolina Głogowska. Together these form a wide, low-lying valley corridor cut into the surrounding Silesian lowlands.

Within this corridor the terrain alternates between the active river channel, its floodplain terraces, old embankments and depressions. Oxbow lakes mark former river meanders, while shallow groundwater-defined depressions support peatland communities. The result is a finely textured valley floor in which fragments of cultivated land alternate with retained wetland mosaics, wet meadows, willow thickets and patches of floodplain forest. Although the original continuous marshlands were largely drained in the eighteenth century, the surviving natural belt along the river remains a vivid expression of Oder valley morphology and hydrology.

Ecologically Łęgi Odrzańskie is built around a continuous mosaic of floodplain and wetland habitats that together form roughly seventy percent of the site area. According to the current Standard Data Form for the site, eleven habitat types under the EU Habitats Directive occur within Łęgi Odrzańskie, including two priority habitats. The habitat complex reflects the hydrological gradient of the Oder valley and includes floodplain forests, riverine oak-hornbeam woodland, willow floodplain shrub, alder carrs, wet and flooded meadows, peatlands and oxbow water bodies.

Plant diversity within the site includes protected aquatic species such as water caltrop (Trapa natans) and floating watermoss (Salvinia natans), while invertebrate fauna includes rare moths and butterflies such as the Kentish glory (Endromis versicolora, "barczatka kataks" in Polish) and the Scarce Fritillary (Euphydryas maturna, "przeplatka maturna"). The combination of nutrient-rich river water, standing oxbow waters, peatland and seasonally flooded meadows produces a layered habitat structure in which aquatic, wetland, meadow and forest communities are closely interlinked along the valley.

Fauna is a central element of Łęgi Odrzańskie's identity. The site supports protected populations of two amphibian species, six mammal species, nine invertebrate species and five fish species, together with thirty-five protected bird species. Larger red-listed and internationally protected groups include forty-three species listed in Polish Red Books of plants and animals, thirty-nine rare animal species protected under international conventions, thirty-four species subject to Polish species protection, nineteen additional rare plant and animal species, and thirteen animal species listed in Annex II of the EU Habitats Directive.

The bird fauna is the site's most distinctive ecological feature. Łęgi Odrzańskie qualifies as an Important Bird Area of European rank (IBA PLB089) and supports at least twenty-five bird species listed in Annex I of the EU Birds Directive. Seven species reach nationally important numbers qualifying the area as an IBA: middle spotted woodpecker, white-tailed eagle, grey-headed woodpecker, red kite, black kite, collared flycatcher and whooper swan. A further eighteen Annex I species occur in the area, including European honey buzzard, little bittern, common kingfisher, black woodpecker, great bittern, hen harrier, marsh harrier, black stork, red-backed shrike, aquatic warbler, spotted crake, European nightjar, wood lark, pied flycatcher, ortolan bunting and common crane. In total at least one hundred bird species have been recorded within Łęgi Odrzańskie.

Łęgi Odrzańskie is one of the most ecologically significant Natura 2000 sites in southwestern Poland and a key riverine corridor in the broader Central European conservation network. Its importance lies in the preservation of eleven Habitats Directive habitat types, including two priority habitats, along a continuous stretch of the Oder valley, in combination with the protection of thirteen Annex II animal species and twenty-five Annex I bird species.

The site's combined designation as a bird protection area and a habitat protection area, formalized through the 2019 merger, gives it a dual legal status under EU nature law. This is reinforced by national-level protections: Polish species protection lists cover thirty-four plant and animal species present in the area, while Polish Red Books list forty-three species. Yet the area faces clear and ongoing pressures. Documented threats include further drainage of wetlands, dam construction, unregulated development of angling, water pollution, introduction of non-native fish species and the privatization of parts of the forest. These pressures make continued active management of the Oder floodplain corridor essential to maintain its existing habitat and species values.

The cultural history of Łęgi Odrzańskie is closely tied to the long-term transformation of the Oder valley. Until the mid-eighteenth century the valley supported a sparse pattern of fishing villages set within an extensive wetland landscape. The drainage campaign of 1753 reshaped the region's economy and settlement pattern, producing roughly 225,690 morgs of new farmland and attracting farmers from different parts of the Polish-Lithuanian Commonwealth to settle the reclaimed lands. This transformation is still visible in the present contrast between agricultural land on the drained valley floor and the narrow surviving belt of natural riparian habitats along the active river.

Until 1945 the area belonged to Prussia and later Germany, and its incorporation into Poland after the Second World War set the administrative and demographic framework that still defines the region today. The surviving wetland fragments around the Oder remain an important cultural reference point for local communities, valued both as a distinctive element of regional identity and, increasingly, as a shared natural heritage resource coordinated through regional initiatives such as the Kraina Łęgów Odrzańskich Local Action Group.

The strongest highlights of Łęgi Odrzańskie are concentrated in three reinforcing themes: habitat continuity, birdlife, and legal protection. The site's most distinctive highlight is its continuous 101-kilometer stretch of Oder valley floodplain, which preserves an unusually intact riverine habitat mosaic featuring willow thickets, alder carrs, riverine forests, wet meadows, peatlands and oxbow lakes.

Equally central is the exceptional birdlife: the site holds what are described as the largest populations of the middle spotted woodpecker and the whooper swan in Central Europe, plus populations of white-tailed eagle, red and black kites, and collared flycatcher of European conservation importance. Reinforcing both is the formal protection framework of EU-level Natura 2000 status, combined national and EU species protections, eleven Habitats Directive habitat types including two priority habitats, and recognition as an Important Bird Area of European rank.

The character of Łęgi Odrzańskie shifts with the seasons in ways that align closely with the ecology of the Oder floodplain. Spring and early summer are typically the richest period for birdwatching, when breeding songbirds, woodpeckers, raptors and wetland species are most active and detectable across the riverine forests, meadows and oxbows. Late summer and early autumn still offer strong bird activity, with migrating species joining the breeding residents along the Oder corridor.

Because the site is fundamentally a river-floodplain landscape, periods of higher water also enhance the visibility of seasonal flooding across wet meadows and willow floodplain shrub. Cooler months favor viewing larger gatherings of waterbirds and overwintering species, while the wooded sections provide quieter wildlife observation year-round. Visitors should generally expect a dynamic floodplain landscape whose appeal depends strongly on seasonal water levels and bird activity rather than on fixed tourist seasons.