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Location Finland, Etelä-Suomen lääni
Central coordinates 22o 54.00' East  59o 49.00' North
IBA criteria A4i, A4iii, B1i, C3, C4
Area 11,151 ha
Year of IBA assessment 2000


Site description A diverse site situated in the south-west corner of the Hanko peninsula, comprising cliff-lined shores, sand-dunes, wet meadows and an archipelago of mostly small rocky islands. The IBA falls within Salpausselkä, a glacial ridge formation of southern Finland extending several hundred kilometres in length.

Key Biodiversity One of the most important staging areas for waterbirds in the country, with total numbers exceeding 20,000 individuals. Species of global conservation concern that do not meet IBA criteria: Polysticta stelleri (27 birds on passage, irregular and for short periods, 5 individuals in winter), Haliaeetus albicilla (4 individuals in winter, 5 on passage), Gallinago media (2 individuals, passage).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Common Eider Somateria mollissima passage  1996  30,000 individuals  poor  A4i, B1i, C3  Near Threatened 
A4iii Species group - waterbirds passage  1996  20,000-49,999 individuals  unknown  A4iii, C4   

IBA Monitoring

2010 medium unfavourable low
Medium - based upon reliable but incomplete / partially representative data

Human intrusions and disturbance recreational activities happening now small area/few individuals (<10%) no or imperceptible deterioration low
Pollution agricultural & forestry effluents - nutrient loads happening now some of area/population (10-49%) slow but significant deterioration medium
Pollution domestic & urban waste water - sewage happening now small area/few individuals (<10%) slow but significant deterioration low
Transportation and service corridors shipping lanes happening now small area/few individuals (<10%) no or imperceptible deterioration low

Somateria mollissima Common Eider 30000 18000 individuals 60 unfavourable

Some of site covered (10-49%)  No management plan exists but the management planning process has begun  Some limited conservation initiatives are in place  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Hanko western archipelago Baltic Sea Protected Area (Helcom) 5,265 protected area contained by site 5,295  
Tulliniemen luonnonsuojelualue Private Nature Reserve 2,247 protected area overlaps with site 2,338  
Uddskatanin luonnonsuojelualue State Nature Reserve 32 protected area contained by site 29  


IUCN habitat Habitat detail Extent (% of site)
Sea   80%
Coastline   -
Unknown   10%

Land use

Land-use Extent (% of site)
tourism/recreation 50%
urban/industrial/transport 70%
unknown 50%

Protection status National Partial International Partial2,338 ha of IBA covered by Protected Area on Private Land (Tulliniemi, 2,347 ha). 29 ha of IBA covered by Specific Protection Area (Uddskatan, 29 ha). 5,294 ha of IBA covered by Special Protection Area (Tulliniemen linnustonsuojelualue).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Hanko western archipelago. Downloaded from on 26/10/2016

To provide new information to update this factsheet or to correct any errors, please email BirdLife