Sea cliffs in the extreme north-west of mainland Iceland, rising to 534 m. The adjacent waters are also important and are included in the IBA. Recreation is the main human activity in the area, and there is no permanent settlement.
An important seabird colony with the total number of breeding auks numbering c.400,000 pairs. A total of 70,000 pairs of Alca torda nest at this site and at Hælavíkurbjarg (site 031) combined, although it is less common at this site, while less than 10,000 pairs of Fratercula arctica nest at the two sites in total (probably closer to 4,000-5,000 pairs). The site also holds more than 1% of the Icelandic population of Rissa tridactyla, Uria aalge and Uria lomvia.
BirdLife International (2021) Important Bird Areas factsheet: Hornbjarg. Downloaded from http://www.birdlife.org on 18/01/2021.