This Marine IBA is identified using seaward extensions around breeding colonies. It originates from the Japan Exclusive Economic Zone (EEZ) and falls within the Pacific, Northwest FAO ocean region. The site covers an area of 28196 km2 and borders the coastline. The depth ranges from 0 to 2636 m, with a mean annual wind speed of 1.88 m/s and mean annual sea surface temperature falls between 15.19 and 17.21 °C.
1 species triggers IBA criteria at this Marine IBA. Seaward extensions around breeding colony; Tobishima and Osyakujima islands include key near-colony areas for breeding populations of Black-tailed Gull (LC).
BirdLife International (2019) Important Bird Areas factsheet: Tobishima and Osyakujima islands - Marine. Downloaded from http://www.birdlife.org on 17/10/2019.