Oshima island

Country/territory: Japan

IBA Criteria met: A1, A2 (2004)
For more information about IBA criteria please click here

Area: 9,105 ha

Protection status:

Wild Bird Society of Japan
Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2015 medium not assessed high
For more information about IBA monitoring please click here

Site description
Ohshima, which is located about 110 km south of Tokyo metropolitan area, is the largest island in the Izushoto islands. These islands fall within the Tokyo administrative district even though they are more than 100 km from Tokyo. It has a composite volcano, Mt Miharayama, at the center. We can see precipitous cliffs on the east side of the volcano, and a flat land on the west side. The soil of this island mainly consists of basalt. And outcrops of lava and volcanic ejecta due to repeated eruptions can be seen everywhere.

Recommended citation
BirdLife International (2021) Important Bird Areas factsheet: Oshima island. Downloaded from on 17/04/2021.