Pradolina Warszawsko-Berlinska is cut by little rivers, flowing to Bzura from Poludniowomazowieckie Hills. There are many fish ponds, from which the most imprtant are Psary, Okret and Rydwan, Borow i Walewice.

The most important river in the refuge is Bzura, which valley is strongly peated. Middle width of river valley riches almost 2 km.

Dominating biotypes:

• Meadows and pastures,
• Arable lands,
• Peatbogs.

Birds mentioned in Appendix I of Birds Directive:

• Great bittern
• Little bittern,
• Great egret,
• Purple heron,
• Black stork,
• White stork,
• Bewick's swan,
• Whooper swan,
• Barnacle goose,
• White-tailed eagle,
• Marsh harrier,
• Montagu's harrier,
• Spotted crake,
• Little crake
• Corn crake,
• Common crane
• Ruff
• Common tern,
• Whiskered tern,
• Black tern,
• European kingfisher,
• Black woodpecker,
• Woodlark,
• Tawny pipit,
• Bluethroat,
• Barred warbler,
• Red-backed shrike,
• Ortolan bunting.

Existing forms of protection:

• Blonie nature reserve

Areas of Protected Landscape: Bzura valley, Warta and Ner valley, Warszawsko-Berlinska valley.