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Location Japan, Shimane,Tottori
Central coordinates 133o 12.00' East  35o 28.00' North
IBA criteria A4i, A4iii
Area 10,000 ha
Altitude 0 - 5m
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description Lake Nakaumi is about 9,200 ha and the fifth largest lake in Japan located on the border of Tottori Prefecture and Shimane Prefecture. It is a brackish lake with an average depth of 6 m. The lake is connected with the Japan Sea on the north while its west part is connected with Lake Shinjiko. The site is one of the most important wintering grounds for waterfowl; 50,000-75,000 birds winter here every year.

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 
Common Pochard Aythya ferina winter  2004  present  A4i  Vulnerable 
Tufted Duck Aythya fuligula winter  2004  present  A4i  Least Concern 
Greater Scaup Aythya marila winter  2004  present  A4i  Least Concern 
A4iii Species group - waterbirds winter  2004  min 20,000 individuals  A4iii   

IBA Monitoring

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

Natural system modifications other ecosystem modifications likely in long term (beyond 4 years) majority/most of area/population (50-90%) slow but significant deterioration medium

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90%) covered by appropriate conservation designation  A management plan exists but it is out of date or not comprehensive  Unknown  low 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)  
Nakaumi National Wildlife Special Protected Area 8,462 is identical to site 8,462  
Nakaumi Prefectural Wildlife Protection Area 8,800 protected area contained by site 8,800  
Nakaumi Wetlands of International Importance (Ramsar) 8,043 protected area contained by site 8,043  


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Coastal lagoons  -

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

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