Rockabill () is a group of two islands, "The Rock" and "The Bill", lying in the western

Irish Sea The Irish Sea or , gv, Y Keayn Yernagh, sco, Erse Sie, gd, Muir Èireann , Ulster-Scots: ''Airish Sea'', cy, Môr Iwerddon . is an extensive body of water that separates the islands of Ireland and Great Britain. It is linked to the C ...

about 6 kilometres east-north-east of Skerries,

County Dublin "Action to match our speech" , image_map = Island_of_Ireland_location_map_Dublin.svg , map_alt = map showing County Dublin as a small area of darker green on the east coast within the lighter green background of ...

Ireland Ireland ( ; ga, Éire ; Ulster-Scots: ) is an island in the North Atlantic Ocean, in north-western Europe. It is separated from Great Britain to its east by the North Channel, the Irish Sea, and St George's Channel. Ireland is the s ...

. An alternative Irish name, ''Carraig Dhá Bheola'', meaning ''Two Lips Rock'', is probably just a corruption of Carraig Dábhiolla. The two granite islands are separated by a channel about 20 metres wide. On the Rock there is a

lighthouse A lighthouse is a tower, building, or other type of physical structure designed to emit light from a system of lamps and lenses and to serve as a beacon for navigational aid, for maritime pilots at sea or on inland waterways. Lighthouses mark ...

, built 1855–1860 from

granite Granite () is a coarse-grained (phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underg ...

and

limestone Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms when ...

and automated in 1989, and several walls and outbuildings. These walled areas have enabled a build-up of soil and the establishment of vegetation, notably tree mallow ('' Lavatera arborea''), which provides nesting cover for the birds. The Bill is smaller and has very little vegetation. Rockabill is an important

seabird Seabirds (also known as marine birds) are birds that are adapted to life within the marine environment. While seabirds vary greatly in lifestyle, behaviour and physiology, they often exhibit striking convergent evolution, as the same envir ...

breeding island, especially notable for its

tern Terns are seabirds in the family Laridae that have a worldwide distribution and are normally found near the sea, rivers, or wetlands. Terns are treated as a subgroup of the family Laridae which includes gulls and skimmers and consists of ...

s. It is an internationally important site for

roseate tern The roseate tern (''Sterna dougallii'') is a species of tern in the family Laridae. The genus name ''Sterna'' is derived from Old English "stearn", "tern", and the specific ''dougallii'' refers to Scottish physician and collector Dr Peter McDoug ...

s, with the largest colony in Europe, 1,597 pairs, and 2,085 pairs of Common Terns (2017 data). Other seabirds include

black guillemot The black guillemot or tystie (''Cepphus grylle'') is a medium-sized seabird of the Alcidae family, native throughout northern Atlantic coasts and eastern North American coasts. It is resident in much of its range, but large populations from the ...

s and

black-legged kittiwake The black-legged kittiwake (''Rissa tridactyla'') is a seabird species in the gull family Laridae. This species was first described by Carl Linnaeus in his landmark 1758 10th edition of ''Systema Naturae'' as ''Larus tridactylus''. The English ...

s. Rockabill Lighthouse is owned by the

Commissioners of Irish Lights The Commissioners of Irish Lights ( ga, Coimisinéirí Soilse na hÉireann), often shortened to Irish Lights or CIL, is the body that serves as the general lighthouse authority for Northern Ireland and the Republic of Ireland and their adjacent ...

and is a Refuge for Fauna and a

Special Protection Area A Special Protection Area (SPA) is a designation under the European Union Directive on the Conservation of Wild Birds. Under the Directive, Member States of the European Union (EU) have a duty to safeguard the habitats of migratory birds and certa ...

under the

European Union The European Union (EU) is a supranational political and economic union of member states that are located primarily in Europe. The union has a total area of and an estimated total population of about 447million. The EU has often been ...

Birds Directive. Since 1989, when the protection afforded by the lighthouse keepers ceased, the islands have been managed by

BirdWatch Ireland BirdWatch Ireland (BWI) is a voluntary conservation organisation devoted to the conservation and protection of wild birds and their habitats in Ireland. It was formerly known as the Irish Wildbird Conservancy (IWC). Irish Wildbird Conservancy was f ...

. The sea area between Rockabill and

Dalkey Island Dalkey Island ( ) is an island for which the nearby village of Dalkey is named ( ga, Oileán Dheilginse meaning "thorn island", with ''ey'' the Old Norse (Viking) version of "island"). It is an uninhabited island located in the Barony of Upper ...

has recently been proposed as a

Special Area of Conservation A Special Area of Conservation (SAC) is defined in the European Union's Habitats Directive (92/43/EEC), also known as the ''Directive on the Conservation of Natural Habitats and of Wild Fauna and Flora''. They are to protect the 220 habitats and ap ...

References

{{refend Islands of County Dublin Uninhabited islands of Ireland