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Location Japan, Hokkaido
Central coordinates 144o 24.00' East  43o 56.00' North
IBA criteria A1, A3, A4i
Area 2,200 ha
Altitude 0 - 5m
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description Lake Tohutsuko lies between Abashiri City and Koshimizu Town in eastern Hokkaido. The narrow strip of sand dune (Koshimizu Gensei Kaen) separates Tohutsuko, an inland sea-lake, from the sea. The lake has an area of 900 ha with 27.3 km of the shoreline, and an average depth of 1.1 m. The lake is relatively shallow with the deepest part being 2.5 m. Some rivers flow into the lake, and approximately 118 ha of wetlands are found around the lake. Alnus japonice forest is around the rivers, and the marsh is dominated mainly by Carex and Phragmites australis, and few Typha latifolia and Scirpus tabernaemontani. In the brackish water, a salt marsh exists with Salicornia europaea and Triglochin maritima.. Cattle have been grazing selectively, so communities of Iris setosa, Rose rugosa and Themopsis lupinoides are found in patches.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Red-crowned Crane Grus japonensis resident  2004  present  A1, A3  Endangered 
Grey-tailed Tattler Tringa brevipes passage  2004  present  A4i  Near Threatened 
Latham's Snipe Gallinago hardwickii breeding  2004  present  A3  Least Concern 

IBA Monitoring

2010 low not assessed medium
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90%) covered by appropriate conservation designation  A management plan exists but it is out of date or not comprehensive  Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity  medium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)  
Abashiri Quasi National Park 43,559 protected area contains site 2,200  
Tofutsu-ko Wetlands of International Importance (Ramsar) 900 protected area contained by site 900  
Tofutsuko National Wildlife Special Protected Area 2,051 protected area contained by site 2,051  
Tohfutsuko Prefectural Wildlife Protection Area 2,051 protected area contained by site 2,051  


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

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Lake Tofutsu. Downloaded from on 21/10/2016

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