The site lies in the Drwêca river valley between Brodnica town and the road between Jajkowo and G³êboczek villages, and includes the lower parts of the Brynica and Samionka river valleys, Sopieñ lake and Ostrów lake. The valley is 600 m to 3 km in width and includes a canal system and oxbow lakes. The Drwêca river has a natural character and meanders strongly; overflow in early spring causes extensive flooding. The vegetation is species-rich; besides meadows there are reedbeds Phragmites, sedge-beds and small stands of alder Alnus woodland.
Over 200 species have been recorded, 140 of them breeding. Species of global conservation concern that do not meet IBA criteria: Aythya nyroca (up to two birds on passage), Haliaeetus albicilla (up to five non-breeding birds), Crex crex (4-9 breeding pairs).
Pressure/threats to key biodiversity
Threats to birds include the abandonment of land management, disturbance, and hunting and poaching.
National High International None1,287 ha of IBA covered by Nature Reserve (Rzeka Drwêca, 1,287 ha). 3,400 ha of IBA covered by Protected Landscape Area (Dolina Drwêcy, 61,641 ha).