Country/territory: Belarus

IBA criteria met: B2, B3 (2000)
For more information about IBA criteria, please click here

Area: 30,429 ha

Site description (baseline)
The site is a large complex of lakes, forests, and transition and bog mires. The core of the IBA is Osveia Lake which defines much of the hydrology and climate of northern Belarus.

Key biodiversity
A total of 164 breeding bird species have been recorded, including 36 species listed in the National Red Data Book. Osveia Lake is one of the largest breeding and post-breeding grounds in Belarus for numerous huntable waterbird species: Mallard Anas platyrhynchos, Pochard Aythya ferina, and Coot Fulica atra. The Lake and the surrounding areas have a high value for large concentrations of waterbirds during spring and autumn migration.

Non-bird biodiversity: A total of 16 National Red Data Book plant species have been recorded. Some rare plants include hybrids of Black Alder and Grey Alder (Alnus glutinosa and A. incana), tall-stalk forms of Betula pendula var. carelica, a large population of Yellow Pondlily Nuphar pumila, as well as a rare insectivorous plant Waterwheel Aldrovanda vesiculosa.Four mammal species found on the site are listed in the National Red Data Book of Belarus.

Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Asvieja. Downloaded from on 29/05/2023.