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Location Japan, Aomori
Central coordinates 140o 58.00' East  40o 59.00' North
IBA criteria A4i
Area 9,800 ha
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description The site is the sea area, southward from Yakeyamazaki, Saimura Village of Shimokita Peninsula and Takanozaki, Imabetsumachi Town of Tsugaru Peninsula. The whole coastline is about 46 km, and the bay area is about 1,660 km2, with average water depth of 38 m, mostly sandy beach with some reefs. A small tidal flat appears at Ashizaki, Ohminato Bay, Mutsu City in the north of Mutsu Bay, and at Asadokorokaigan coast, Hirauchimachi Town in the south of Mutsu Bay.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Brent Goose Branta bernicla winter  2004  present  A4i  Least Concern 
Whooper Swan Cygnus cygnus winter  2004  present  A4i  Least Concern 

IBA Monitoring

2010 low not assessed negligible

Energy production and mining renewable energy happening now small area/few individuals (<10%) slow but significant 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)  
Mutsu - City Ashizaki - Bay Fisheries Resources Protected Area 16 unknown 0  


IUCN habitat Habitat detail Extent (% of site)
Coastline   -

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Mutsu bay. Downloaded from on 24/10/2016

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