|Central coordinates||28o 7.00' East 56o 5.00' North|
|Altitude||131 - 169m|
|Year of IBA assessment||2000|
Site description 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.
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Common Pochard Aythya ferina||breeding||1988||400-600 breeding pairs||good||B3||Least Concern|
|Great Bittern Botaurus stellaris||breeding||1988||40-60 breeding pairs||medium||B2||Least Concern|
|Protected area||Designation||Area (ha)||Relationship with IBA||Overlap with IBA (ha)|
|Osveiski||Wetlands of International Importance (Ramsar)||45,200||protected area contains site||22,600|
|Osveyskiy||Nature Sanctuary or Partial Reserve||22,600||protected area contains site||22,600|
|IUCN habitat||Habitat detail||Extent (% of site)|
|Wetlands (inland)||Raised bogs; Standing freshwater; Water fringe vegetation||50%|
|Land-use||Extent (% of site)|
|nature conservation and research||20%|
Other 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.
Protection status National Conservation Status: A national landscape zakaznik was established in 2000 on the basis of the former hunting zakaznik.International Conservation Status: An IBA was established in 1998 (code BY001, criteria Â2, Â3).Ramsar site (criterion 1, 5, 6).
References A.Kozulin, L.Vergeichik, M.Nikiforov and others. Treasures of Belarusian nature.- Minsk, 2002. -160 p.
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Asvieja. Downloaded from http://www.birdlife.org on 06/12/2013
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