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Location Japan, Yamagata
Central coordinates 139o 50.00' East  38o 54.00' North
IBA criteria A4i, A4iii
Area 1,732 ha
Altitude 0 - 8m
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description The Mogamigawa river that runs in the northwest of Yamagata Prefecture is one of the three main rapid streams in Japan. The Mogamigawa estuary is a wintering ground for some 10,000 swans. Besides the swans, wild ducks and sea gulls also visit this area. Peregrine Falcons and Goshawks/Northern Goshawks visit here to hunt for the waterfowl.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Northern Pintail Anas acuta winter  2004  present  A4i  Least Concern 
Whooper Swan Cygnus cygnus winter  2004  present  A4i  Least Concern 
Tundra Swan Cygnus columbianus winter  2004  present  A4i  Least Concern 
A4iii Species group - waterbirds winter  2004  min 20,000 individuals  A4iii   

IBA Monitoring

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

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  Unknown  Unknown  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Mogami Prefectural Wildlife Protection Area 1,732 is identical to site 1,732  


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Rivers and streams  -

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Recommended citation  BirdLife International (2015) Important Bird Areas factsheet: Mogamigawa estuary. Downloaded from on 07/10/2015

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