Location
The site is situated in Lodz voivodeship, within the communes of Bedlno, Krzyzanow, Kutno, Leczyca, Gora Swietej Malgorzaty, Grabow, Leczyca, Piatek, Swinice Warckie, Witonia, Lowicz, Bielawy, Domaniewice, Lowicz, Zduny, Dabie.

Landscape
The Bzura-Ner pravalley is a fragment of Warsaw-Berlin pravalley. The Warsaw-Berlin pravalley had been formed in Pleistocene by glacier moving back from the territory of Poland. This enormous concave form had been created by big rivers which were made form the melting glacier. The bottom of the pravalley is flat partly covered by fen plains. In the eastern part of the site the Bzura River flows and in the western part of the area Ner, Warta, Obra, Odra and Sprewa rivers flow on the territory of Germany.

Rivers
The Bzura river (166 km) is the left tributary of Vistula river. It flows along northern part of the Rownina Lowicko-Blonska. The waters of Bzura from its left side are streamed by Ochna and Sludwia, and from its right side by Moszczenica, Mroga, Struga, Bobrowka, Skierniewka, Rawka, Pisa, Sucha, Utrata rivers. The Ner river flows out near Wisniowa Mountain near the city of Lodz, and flows into Warta river near Majdany countryside. It is about 134 km long.

Ecosystem
The Bzura-Ner pravally is dominated by meadows and scrub communities and arable lands. The fens and transition mires, situated on peat deposits, cover the central part of the site. A very rare phenomenon occurs in the area of the habitat - it is called regeneration succession, which allows rebuilding natural riparian forests, reedbeds communities and ash-alder alluvial forests, by stopping agricultural activity. In some places you can also admire salt vegetation but vast area of the site is covered by mowing and arable meadows as well as big patches of sedge beds, reedbeds, riverine willow thickets and swamp alder woods.

Natura 2000 Program included under special protection important European habitats of:

• riparian forests and riverine willow thickets;
• lowland and mountain extensively used meadows;
• old riverbeds and others euthrophic water bodies;
• inland salt meadows;
• calcerous fens;
• transition mires and quaking bogs;
• hard oligo-mesothrophic water bodies with benthic vegetation;
• molinia meadows on calcerous, peaty or clavey-silt-laden soils.

Flora and fauna
Among flora and fauna of the site the most valuable plant species are endangered orchids like - Heat Spotted Orchid, Broad-leaved Marsh and Orchid, Orchid Palustris. Also vast water vegetation representation occurs in the site: European Common Twayblade, Yellow Pond Lilly, White Water Lilly, Marsh Pea and Senecio Paluster.

The site is also famous as a breeding habitat of numerous bird species. You can meet here: Ortolan Bunting, Red Bucked Shrike, Tawny Pipit, Barred Warbler, Aquatic Warbler, Bluethroat, Woodlark, Black Woodpacker, Common Kingfisher, Short-eared Owl, Common, Whiskered and Black Tern, Ruff, Corn Crake, Little Crake, Common Crane, Montagu's, Marsh and Hen Harrier, Black and Red Kite, Black and White Stork, Great and Little Bittern and many more species. The site is also important refuge for valuable amphibians and reptiles like: Great Crested Newt, Yellow Bellied Toad, Blind Worm, Common European Viper and Grass Snake. In the vicinity of rivers one can spot European Beavers and otters.

Nature conservation
The area of Bzura-Ner pravalley is covered by the following forms of nature conservation:

• Blonie nature reserve
• Area of Protected Landscape: Dolina Bzury
• Area of Protected Landscape: Doliny Warty i Neru,
• Area of Protected Landscape: Pradolina Warszawsko-Berlińska.