Ireland (pronounced /ˈaɾlənd/; ) is the third largest island in Europe, and the twentieth-largest island in the world. It lies to the north-west of continental Europe and is surrounded by hundreds of islands and islets. To the east of Ireland, separated by the Irish Sea, is the island of Great Britain. Politically, the state Ireland (described as the Republic of Ireland in cases of ambiguity) covers five-sixths of the island, with Northern Ireland, part of the United Kingdom, covering the remainder in the north-east.

The population of the island is slightly over 6 million (2007), with 4.4 million in the Republic of Ireland (1.7 million in Greater Dublin) and an estimated 1.75 million in Northern Ireland (800,000 in Greater Belfast). This is a significant increase from a modern historical low in the 1960s, but still much lower than the peak population of over 8 million in the early 19th century, prior to the Great Famine.

The name Ireland derives from the name Ériu (in modern Irish, Éire) with the addition of the Germanic word land. Most other western European names for Ireland derive from the same source, such as French Irlande, Spanish, Italian, Romanian and Portuguese Irlanda, German Irland, Dutch Ierland, and Russian Ирландия 1.

Political geography

The island of Ireland has two distinct jurisdictions:

• Ireland (description is the Republic of Ireland), a sovereign state, covers five-sixths of the island. Its capital is Dublin.
• Northern Ireland, part of the United Kingdom of Great Britain and Northern Ireland, covers the remaining sixth. Its capital is Belfast.

For the political history of the island, see History of Ireland, for other political institutions of the Republic see .

Traditionally, Ireland is subdivided into four provinces: Connacht, Leinster, Munster and Ulster; and, in a system developed between the 13th and 17th centuries, 32 counties. Twenty-six of the counties are in the Republic of Ireland, and the remaining six (all in Ulster) are in Northern Ireland. Notably, based on boundaries established in the Early Modern period, Ulster and Northern Ireland are neither synonymous nor co-extensive, as three counties of Ulster (Cavan, Donegal and Monaghan) are part of the Republic. Nonetheless, 'Ulster' is often used colloquially as a synonym for Northern Ireland. Counties Dublin, Cork, Limerick, Galway, Waterford and Tipperary have been broken up into smaller administrative areas, but are still considered by Ordnance Survey Ireland to be official counties. The counties in Northern Ireland are no longer used for local government, although their traditional boundaries are still used in sports and in some other cultural and ceremonial areas.