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Location Japan, Miyagi
Central coordinates 141o 8.00' East  38o 46.00' North
IBA criteria A4i
Area 10 ha
Altitude 8 - 10m
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description A tributary of the Kitakamigawa river in Miyagi Prefecture, the Hasamagawa river flows relatively slowly with its low pitched riverbed. Most stream sides are covered with Salix forests, leaving little room for wide riversides. Improvement works have been undertaken since early times in the middle stream of the river, and these improvements have resulted in pebbles, gravel and sand being deposited alongside the river. Outside the urban districts, small villages are scattered in the rice paddy areas. Improvement works in the downstream of the river basin have separated the river into the stream and the surrounding higher dry level areas. Many former fields and paddy fields in the leveled lands have turned into dry grass fields now. Few wet grasslands are found along the river, and growth of forests is hindered in the area.

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 


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

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Hasama river. Downloaded from on 26/10/2016

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