Inner Tokyo bay

Country/territory: Japan

IBA Criteria met: A4i, A4iii (2004)
For more information about IBA criteria please click here

Area: 16,000 ha

Wild Bird Society of Japan
Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2015 high unfavourable low
For more information about IBA monitoring please click here

Site description
Since Tokyo Bay had sandy shallows for a good distance from the shore, its reclamation has been carried out. The reclaimed ground was once utilized for factories, but then they have been replaced by office buildings and high rise residences as a result of redevelopment. A campaign to conserve the few natural tidal flats including Sanbanse has been set up. The tidal flats are in the inner Tokyo Bay and include the Tamagawa river estuary, Sanmaisu (Tokyo), Sanbanse (Chiba), Shiohama (Chiba) and Yatsu-kigata (Chiba).

Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Inner Tokyo bay. Downloaded from on 19/08/2022.