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Pub culture, as it is termed, pervades Irish society, across all cultural divides. The term refers to the Irish habit of frequenting public houses (pubs) or bars. Traditional pub culture is concerned with more than just drinking, even though Ireland has a recognised problem with over-consumption of alcohol, with the highest drink consumption in Europe. Per capita alcohol consumption increased by 41% in the period 1989 to 1999. Typically pubs are important meeting places, where people can gather today in the modern Ireland and meet their neighbours and friends in a relaxed atmosphere. Pubs vary widely according to the clientele they serve, and the area they are in. Best known, and loved amongst tourists is the traditional pub, with its tradional Irish music (or "trad music"), tavern-like warmness, and memorabilia filling it.

The late nineteenth and early twentieth centuries saw a vigorous but unsuccessful campaign for Irish home rule, followed by the eclipse of moderate nationalism by militant separatism. In 1922, following the Anglo-Irish War, the twenty-six counties of Ireland seceded from the United Kingdom as the Irish Free State. The remaining six, in the north-east, remained within the Union as Northern Ireland. Secession for southern Ireland led directly to the Civil War, as militant nationalists split into two factions and turned against one another.

A ring of coastal mountains surrounds low central plains. The highest peak is Carrauntuohill (Irish: Corrán Tuathail), which is 1041 m (3414 feet). The island is bisected by the River Shannon, at 113 km (70 mi) the longest river in Ireland or Britain. The island's lush vegetation, a product of its mild climate and frequent but soft rainfall, earns it the sobriquet "Emerald Isle".

The parliament of the Republic of Ireland is the Oireachtas. The Oireachtas consists of the President and two houses: Dáil Éireann and Seanad Éireann (also known as the Senate). The Dáil is by far the dominant tier of the legislature. The President may not veto laws in most circumstances and the Senate may only delay legislation.

Northern Ireland is an administrative region and one of four constituent parts of the United Kingdom. It is located on the island of Ireland, where it shares a land border with the Republic of Ireland, the only part of the United Kingdom with a land border. It covers 14,139 square kilometres (5,459 square miles) in the north-east of the island of Ireland, about a sixth of the total area of the island, and has a population of 1,685,000 (April 2001) — between a quarter and a third of the total island's population.