Watercourses, deciduous forests, meadows and pastures are dominating biotypes of the refuge.

Birds mentioned in Appendix I of Birds Directive:

• Little bittern,
• Black stork,
• Ferruginous duck,
• Smew,
• White-tailed eagle,
• Marsh harrier,
• Corn crake,
• Stone curlew,
• Red-necked phalarope,
• Mediterranean gull,
• Little gull,
• Caspian tern,
• Common tern,
• Little tern,
• Black tern,
• European kingfisher,
• Black woodpecker,
• Middle spotted woodpecker,
• Tawny pipit,
• Bluethroat,
• Barred warbler,
• Red-breasted flycatcher,
• Red-backed shrike.

Existing forms of nature protection:

• Nature reserves: Kepa Antoninska, Kepa Rakowska, Kepa Wykowska, Kepy Kazunskie, Lachy Brzeskie, Lawice Kielpinskie, Lawice Troszynskie, Ruska Kepa, Wikliny Wislane, Wyspy Bialobrzeskie, Wyspy Kobylnickie (project), Wyspy Zakrzewskie, Wyspy Zawadowskie, Zakole Zakroczymskie,
• Areas of prortected Landscape: Pilica and Drzewiczka River Valleys, Gostyninsko-Gabinski, Nadwislanski I, Nadwislanski II, Nadwislanski III, Warszawski.