Woniesc reservoir

Country/territory: Poland

IBA criteria met: C3, C4, C6 (2010)
For more information about IBA criteria, please click here

Area: 2,738 ha

Ogólnopolskie Towarzystwo Ochrony Ptaków
IBA conservation status
Year of assessment (most recent) Threat (pressure) Condition (state) Action (response)
2010 very high favourable low
For more information about IBA monitoring, please click here

Site description (baseline)
A storage reservoir (777 ha) on the Samica river, connected by the Wonieœæ channel to the Obra river. The reservoir comprises five former lakes (Drzeczkowskie, Witos³awskie, Wojnowskie, Jezierzyckie, Wonieœæ), connected by a narrow channel (c.13 km long, 200-1,300 m wide), with meadows between them. A dam and sluice divide the upper part of the reservoir, where aquatic vegetation is well-developed, from the lower, where such vegetation is very localized. Adjacent there are fish-ponds, forests, meadows and cultivated fields. The reservoir stores water for agriculture and fire-fighting.

Key biodiversity
The globally threatened Aythya nyroca has not bred here since 1995, but the habitat remains and it is believed there is a good chance that it could breed here again, therefore criterion B2 is still applied. Breeding species of global conservation concern that do not meet IBA criteria: Haliaeetus albicilla (one pair). Other notable breeding species include Anas strepera (22 pairs) and Chlidonias niger (20-60 pairs).

Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Woniesc reservoir. Downloaded from on 05/06/2023.