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Location Bulgaria, Burgas
Central coordinates 26o 43.50' East  42o 2.90' North
IBA criteria B2, C6
Area 34,864 ha
Altitude 121 - 549m
Year of IBA assessment 2005

Bulgarian Society for the Protection of Birds

Site description The Derventski hills are situated between the Tundzha river and the border with Turkey. They are partly covered by broadleaved deciduous forests of Quercus and Carpinus, with Mediterranean trees and shrubs, and there are also open grassy and bushy areas with scattered trees, and arable land. Shrubland is dominated by Paliurus, Jasminum and Nigella. Land-uses are extensive stock-rearing and cultivation, hunting and forestry.

Key Biodiversity One of the most important breeding sites for Aquila pomarina in Bulgaria. Significant proportion (³1%) of national population breeding at site: Circaetus gallicus (1 pair), Bubo bubo (1 pair), Dendrocopos medius (min. 3 pairs), Hippolais olivetorum (min. 2 pairs).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Black Stork Ciconia nigra breeding  2000  7 breeding pairs  good  C6  Least Concern 
Lesser Spotted Eagle Clanga pomarina breeding  2001  15 breeding pairs  good  B2, C6  Least Concern 
Western Marsh-harrier Circus aeruginosus resident  2001  3-4 breeding pairs  good  C6  Least Concern 
Montagu's Harrier Circus pygargus resident  2001  5-7 breeding pairs  good  C6  Least Concern 
Booted Eagle Hieraaetus pennatus breeding  2001  3-5 breeding pairs  good  B2, C6  Least Concern 
Milvus migrans breeding  2001  4-5 breeding pairs  good  C6  Not Recognised 
Olive-tree Warbler Hippolais olivetorum breeding  2005  400 breeding pairs  good  B2, C6  Least Concern 


IUCN habitat Habitat detail Extent (% of site)
Forest Broadleaved deciduous woodland  58%
Shrubland Sclerophyllous scrub, garrigue and maquis; Scrub  23%
Grassland Mesophile grasslands; Steppes and dry calcareous grassland  7%
Artificial - terrestrial Arable land  12%

Land use

Land-use Extent (% of site)
agriculture 42%
forestry 58%
hunting -

Protection status National None International None

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Derventski Heights. Downloaded from on 24/10/2016

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