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Location Japan, Hokkaido
Central coordinates 141o 50.00' East  43o 24.00' North
IBA criteria A4i, A4iii
Area 19,000 ha
Altitude 10 - 15m
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description Miyajimanuma, Tegatanuma (Bibai City), Misuminuma (Iwamisawa City), Urausunuma, Shinnuma (Urausu Town), Chashinainuma (Naie Town), Fukurochinuma (Shintotsukawa Town, Sunagawa City) are mainly crescentic lakes located at the middle Ishikarigawa river basin. Surrounding areas are agricultural lands, mainly for rice crop, and lowland swamp vegetation such as Alnus japonica, Salix and Phragmites australis are found around lakes and marshes. At Tsukigase swamp including Ohnuma and Konuma, highland swamp flora is left in part.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Bean Goose Anser fabalis passage  2004  present  A4i  Least Concern 
Greater White-fronted Goose Anser albifrons passage  2004  present  A4i  Least Concern 
Whooper Swan Cygnus cygnus passage  2004  present  A4i  Least Concern 
Tundra Swan Cygnus columbianus passage  2004  present  A4i  Least Concern 
A4iii Species group - waterbirds passage  2004  min 20,000 individuals  A4iii   

IBA Monitoring

2010 medium not assessed medium

Pollution agricultural & forestry effluents - type unknown/unrecorded likely in long term (beyond 4 years) some of area/population (10-49%) moderate to rapid deterioration medium

Little/none of site covered (<10%)  A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species  The conservation measures needed for the site are being comprehensively and effectively implemented  medium 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Miyajima-numa Wetlands of International Importance (Ramsar) 41 protected area contained by site 41  


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Freshwater lakes and pools  -

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Middle Ishikari River basin. Downloaded from on 24/10/2016

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