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Location Japan, Fukuoka
Central coordinates 130o 6.00' East  34o 14.00' North
IBA criteria A1, A2, A4ii
Area 97 ha
Altitude 0 - 243m
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description Okinoshima is an islet off of Fukuoka City having an area of 85 ha. The northwest and south sides of the islet are covered with deep forests mainly composed of Machilus tunbergii. Koyajima is a rocky reef situated about 1km south-southeast of Okinoshima. There are no trees covering the rocky reef leaving it almost naked except Carex oahuensis.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Streaked Shearwater Calonectris leucomelas breeding  2004  present  A4ii  Near Threatened 
Japanese Murrelet Synthliboramphus wumizusume breeding  2004  present  A1, A4ii  Vulnerable 
Japanese Woodpigeon Columba janthina resident  2004  present  A2  Near Threatened 
Pleske's Grasshopper-warbler Locustella pleskei breeding  2004  present  A1  Vulnerable 

IBA Monitoring

2010 high not assessed low
Poor - based on little, or potentially unreliable/unrepresentative, data

Invasive & other problematic species, genes & diseases problematic native species/diseases - unspecified species likely in short term (within 4 years) whole area/population (>90%) moderate to rapid deterioration high

Whole area of site (>90%) covered by appropriate conservation designation  Unknown  Unknown  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Okinoshima National Wildlife Special Protected Area 97 is identical to site 97  


IUCN habitat Habitat detail Extent (% of site)
Forest   -
Coastline Sea cliffs and rocky shores  -

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Okinoshima and Koyajima islets. Downloaded from on 26/10/2016

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