This Marine IBA is identified using seaward extensions around breeding colonies. It originates from the South Korea Exclusive Economic Zone (EEZ) and falls within the Pacific, Northwest FAO ocean region. The site covers an area of 1199 km2 and is 44 km away from the closet coastline. The depth ranges from 0 to 57 m, mean annual sea surface temperature falls between 13.74 and 14.9 °C and mean annual chlorophyll-a concentrations found to range between 2.1 and 4.03 mg/m3.
4 species trigger IBA criteria at this Marine IBA. Seaward extensions around breeding colony; Chilbal-do island include key near-colony areas for breeding populations of Streaked Shearwater (LC) , Ancient Murrelet (LC) and Japanese Murrelet (VU).
BirdLife International (2020) Important Bird Areas factsheet: Chilbal-do island - Marine. Downloaded from http://www.birdlife.org on 30/10/2020.