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Location Japan, Kochi
Central coordinates 132o 33.00' East  32o 44.00' North
IBA criteria A1, A2
Area 1,200 ha
Altitude 0 - 404m
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description The site is situated in the southwest of Kochi Prefecture. Influenced by the Japan Current the climate of the islands is warm with a relatively high temperature and high humidity. Many plants with subtropical features grow. In the sea bottoms groups of reef forming beautiful hermatypics are in existence. Fish are also abundant and diversified. Okinoshima is consisted of granite and there are series of cliffs eroded by seawater and steep slopes. In Biroujima there are communities of herbaceous plants, and also communities of Machilus tunbergii are seen.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Japanese Murrelet Synthliboramphus wumizusume breeding  2004  present  A1  Vulnerable 
Japanese Woodpigeon Columba janthina resident  2004  present  A2  Near Threatened 

IBA Monitoring

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

Invasive & other problematic species, genes & diseases problematic native species/diseases - unspecified species likely in long term (beyond 4 years) some of area/population (10-49%) no or imperceptible deterioration low

Little/none of site covered (<10%)  Unknown  Unknown  negligible 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Ashizuri Uwakai National Park 11,166 protected area contains site 1,200  


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

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Recommended citation  BirdLife International (2015) Important Bird and Biodiversity Area factsheet: Seinan islands. Downloaded from on 30/11/2015

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