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Location Japan, Hokkaido
Central coordinates 142o 18.00' East  45o 8.00' North
IBA criteria A4i, A4iii
Area 2,803 ha
Altitude 0 - 5m
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description Kuccharoko lake is an inland sea which faces the Sea of Okhotsk in the north of Hokkaido. The lake consists of two small lakes, Onuma (5.5 m diameter) and Konuma (3m diameter), and is 27 km around, with an average water depth of 1.5 m. During high tide, seawater flows back from Okhotsk Sea, because of the lake's low altitude. Neighboring areas are covered with Carex, Sphagrum and Phragmites australis, and eight rivers flow into the lakes.

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 
A4iii Species group - waterbirds winter  2004  min 20,000 individuals  A4iii   

IBA Monitoring

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

Energy production and mining renewable energy 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90%) covered by appropriate conservation designation  A management plan exists but it is out of date or not comprehensive  Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity  medium 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Hamatonbetsu Kutcharoko National Wildlife Special Protected Area 2,803 is identical to site 2,803  
Kutcharo-ko Wetlands of International Importance (Ramsar) 1,607 protected area contained by site 1,607  


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

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Lake Kuccharo. Downloaded from on 20/10/2016

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