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Location Japan, Fukushima
Central coordinates 140o 6.00' East  37o 29.00' North
IBA criteria A4i
Area 10,933 ha
Altitude 0 - 514m
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description Located in the northwestern part from the center of Fukushima Prefecture, the lake is at 514 m height above sea level, with perimeters of 56 km and 103.3 km2 in area. Due to inflow of strongly acidic groundwater and rivers, the lake shows acidification, with low Chemical Oxygen Demand (COD) in the water and high degree of transparency. The surrounding wetlands include the one with the government designated Natural Monument Akaiyachishoya helophyte community mainly composed of Sphagnum.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Tundra Swan Cygnus columbianus winter  2004  present  A4i  Least Concern 

IBA Monitoring

2010 low not assessed low

Human intrusions and disturbance recreational activities likely in long term (beyond 4 years) some of area/population (10-49%) no or imperceptible deterioration low

Whole area of site (>90%) covered by appropriate conservation designation  A management plan exists but it is out of date or not comprehensive  Unknown  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Bandai - Asahi National Park 186,404 protected area contains site 10,933  
Inawashiro Prefectural Wildlife Protection Area 10,933 is identical to site 10,933  


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: Lake Inawashiro. Downloaded from on 22/10/2016

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