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Location Japan, Hokkaido
Central coordinates 145o 4.00' East  43o 4.00' North
IBA criteria A1, A3
Area 9,300 ha
Altitude 0 - 10m
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description Kiritappu marsh is the second largest peat bog (3,168 ha), after Kushiro Shitugen, on the coastline of eastern Hokkaido. The central area is high moor and has been designated as a Natural Monument. A 4km belt of woods around the marsh captures the mist from the marsh, so a selection of flowers, such as Eriophorum varinatum and Hemerocallis middendorffii can be seen. Also, this site is known as an important breeding ground of A Special Natural Monument, the Japanese Crane. Together with neighboring Hichirippunuma and Mochirippunuma, this area is a Ramsar site. Kiritappu marsh faces Hamanaka bay and Biwase bay on the Pacific Ocean. There are Touhutsushima islet and Kenbokkishima islet and Kojima islet in Biwase Bay. Kenbokkishima and Kojima islets are important nesting sites for sea birds as these islets are not inhabited by people. Kojima islet has one of few colonies of Tufted Puffin in Japan, and Kenbokki islet is a large scale nesting site for Leach's Storm-petrel.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Steller's Sea-eagle Haliaeetus pelagicus winter  2004  present  A1  Vulnerable 
Red-crowned Crane Grus japonensis breeding  2004  present  A1, A3  Endangered 
Latham's Snipe Gallinago hardwickii breeding  2004  present  A3  Least Concern 
Yellow-breasted Bunting Emberiza aureola breeding  2004  present  A3  Endangered 

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

Little/none of site covered (<10%)  A management plan exists but it is out of date or not comprehensive  Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Kiritappu Marsh Reserve 2,905 protected area contained by site 2,905  
Kiritappu-shitsugen Wetlands of International Importance (Ramsar) 2,504 protected area contained by site 2,504  


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Coastal lagoons; Permanent swamps; Salt marshes  -
Coastline   -

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Kiritappu marsh, Biwase bay. Downloaded from on 20/10/2016

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