This Marine IBA is identified using seaward extensions around breeding colonies. It originates from the Cape Verde Exclusive Economic Zone (EEZ) and falls within the Atlantic, Eastern Central FAO ocean region. The site covers an area of 2089 km2 and borders the coastline. The depth ranges from 0 to 3024 m, with a mean annual wind speed of 1.78 m/s, mean annual sea surface temperature falls between 23.9 and 24.4 °C and mean annual chlorophyll-a concentrations found to range between 0.24 and 0.41 mg/m3.
2 species trigger IBA criteria at this Marine IBA. Seaward extensions around breeding colonies; Central mountain range of Ilha de São Nicolau, Ilhéu Raso include key near-colony areas for breeding populations of Red-billed Tropicbird (LC) 75-120 individuals and Fea's Petrel (NT) 90-90 individuals.
BirdLife International (2019) Important Bird Areas factsheet: Raso / São Nicolau - marine. Downloaded from http://www.birdlife.org on 24/07/2019.