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Location Japan, Niigata
Central coordinates 138o 22.00' East  37o 14.00' North
IBA criteria A4i
Area 80 ha
Altitude 0 - 5m
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description Lake Asahiike in Niigata Prefecture is the largest lagoon among six lagoons scattered at northern Kubiki Plain, and the total area is about 79 ha. On the northwestern side of the lagoon, reed beds are found, and Nuphar japonicum, Trapa japonica and Brasenia schreberi grow in the lagoon. Unoike, neighboring the western side of Asahiike is a lagoon of 49ha, and Nelumbo nucifera cover the entire surface of the lake. Unoike's shape is like a peninsula jutting out into the lagoon, and the northwestern side is a city park.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Bean Goose Anser fabalis winter  2004  present  A4i  Least Concern 
Greater White-fronted Goose Anser albifrons winter  2004  present  A4i  Least Concern 

IBA Monitoring

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

No known threats no known threats happening now whole area/population (>90%) 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)  
Sado - Yahiko -Yoneyama Quasi National Park 29,464 protected area contains site 80  


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

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Recommended citation  BirdLife International (2015) Important Bird and Biodiversity Area factsheet: Lakes Asahiike and Unoike. Downloaded from on 29/11/2015

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