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Location Japan, Tokushima
Central coordinates 134o 35.00' East  34o 5.00' North
IBA criteria A4i
Area 3,800 ha
Altitude 0 - 6m
Year of IBA assessment 2004

Wild Bird Society of Japan

Site description The Yoshinogawa river is the largest river in Shikoku, originating from Kamegamori (in Mt Ishizuchisan system) with the total stream length of 193 km and width at the mouth of the river of 1.3km. The lower Yoshinogawa river belongs to Tokushima Prefecture. This site extends from the both sides of the river and from the estuary up to Nadabashi bridge. Surrounding the wide water area, there are sports grounds, farm fields, paddy fields and forests of Salix on the both sides of the river. There also exist sand bars, tidal flats and reed beds in the area. Sandy tidal flats which form islands in the river mouth area expand to a maximum of 60 ha at low tide. And around the reed beds along the river, mud flats of a sludge nature are formed. Among benthic creatures, crabs are most abundant in terms of the numbers of species and individuals. Many large shorebirds come to the site to feed on abundant crabs.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Eurasian Wigeon Mareca penelope winter  2004  present  A4i  Least Concern 

IBA Monitoring

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

Transportation and service corridors roads and railroads happening now some of area/population (10-49%) moderate to rapid deterioration high

Some of site covered (10-49%)  Unknown  Unknown  negligible 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Yoshino Prefectural Wildlife Protection Area 500 protected area contained by site 500  


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

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

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