The two small and remote islands of North Rona and Sula Sgeir lie in the North Atlantic about 65 km from the island of Lewis in the Outer Hebrides off the north-west coast of Scotland. Sula Sgeir is about 15 km west of the far larger North Rona. North Rona is well covered by peat or soil and is vegetated with maritime grassland. Sula Sgeir is subject to severe erosive pressure from sea spray and seabirds and has little soil or vegetation. The islands provide strategically placed nesting localities for large numbers of seabirds which feed in the waters off the north coast of Scotland away from the SPA. They hold a diverse assemblage of species including large numbers of petrels, auks, gulls and Gannet Morus bassanus. It is one of only seven known nesting localities in the EU for Leach's Petrel Oceanodroma leucorhoa.