The IBA comprises two shallow bays in the Gulf of Bothnia and an archipelago of several hundreds of islets and skerries.
The site is important for passage wildfowl and waders. Species of global conservation concern that do not meet IBA criteria: Anser erythropus (2 passage birds), Haliaeetus albicilla (breeding), Crex crex (1-3 breeding pairs), Gallinago media (1-5 passage birds). More than 150 species of bird breed in the IBA, with c.250 species having been recorded in total.
BirdLife International (2019) Important Bird Areas factsheet: Ledskär – Bay of Karlholm. Downloaded from http://www.birdlife.org on 23/08/2019.