Northern Ireland was covered by an ice sheet for most of the last ice age and on numerous previous occasions, the legacy of which can be seen in the extensive coverage of drumlins in Counties Fermanagh, Armagh, Antrim and particularly Down. The centrepiece of Northern Ireland's geography is Lough Neagh, at 392 km² the largest freshwater lake in the British Isles. A second extensive lake system is centred on Lower and Upper Lough Erne in Fermanagh.
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.
The Anglo-Irish Treaty was narrowly ratified by the Dáil in December 1921 but was rejected a large minority, resulting in the Irish Civil War which lasted until 1923. In 1922, in the middle of this war, the Irish Free State came into being. For its first years the new state was governed by the victors of the Civil War. However in the 1930s Fianna Fáil, the party of the opponents of the treaty, were elected into government. The party introduced a new constitution in 1937 which renamed the state to simply "Ireland".
Executive authority is exercised by a cabinet known simply as the Government. The Government consists of the Taoiseach (prime minister), the Tánaiste (deputy prime minister) and up to thirteen other ministers. The Taoiseach is appointed by the President, after being designated by Dáil Éireann (the lower house of parliament). The remaining ministers are nominated by the Taoiseach and approved by the Dáil. The Government must enjoy the confidence of Dáil Éireann and, in the event that they cease to enjoy the support of the lower house, the Taoiseach must either resign or persuade the President to dissolve the Dáil, in which case a general election follows.
There have been recent efforts in Ireland to use renewable energy such as wind energy with large wind farms being constructed in coastal counties such as Mayo and County Antrim. Recently what will be the world's largest offshore wind farm is being developed at Arklow Bank off the coast of Wicklow. It is estimated to generate 10% of Irelands energy needs when it is complete. These constructions have in some cases been delayed by opposition from locals, most recently on Achill Island, some of whom consider the wind turbines to be unsightly. Another issue in the Republic of Ireland is the failure of the aging network to cope with the varying availability of power from such installations. Turlough Hill is the only energy storage mechanism in Ireland.
The vast majority of the population of Northern Ireland identifies with one of two different groups, unionists and nationalists. Both sides of the community are often described by their predominant religious attachments. Unionists are predominantly Protestant (the major Protestant faith is Presbyterianism, the second in terms of size is the Church of Ireland), while nationalists are predominantly Catholic. However, contrary to widespread belief, not all Catholics necessarily support nationalism, and not all Protestants necessarily support unionism. It is also important to note that, in parallel with other parts of Europe, the proportion of the population practising their religious beliefs has fallen dramatically in recent decades, particularly among Catholics and adherents of mainstream Protestant denominations. This has not necessarily resulted in a weakening of communal feeling.
Northern Ireland currently has 18 seats in the United Kingdom House of Commons. The Northern Ireland Assembly has 108 MLAs, although this is currently in suspension. It is also represented in the European Parliament with 3 seats, and at local level by 26 district councils.
The area now known as Northern Ireland has had a diverse history. From serving as the bedrock of Irish resistance in the era of the plantations of Queen Elizabeth and James I in other parts of Ireland, it became itself the subject of major planting of Scottish and English settlers after the Flight of the Earls in 1607 (when the native aristocracy left en masse).
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.
Ulster Scots comprises varieties of the Scots language spoken in Northern Ireland. Many claim it has become a separate language, descended from Scots in Scotland, whereas others question whether Scots is a separate language from English at all, or simply a collection of local dialects of Scottish and Northern Ireland Hiberno-English.
For a comparatively small country, Ireland has made a disproportionate contribution to world literature in all its branches. The works that are best known outside the country are in English, but Irish Gaelic also has the most significant body of written literature, both ancient and recent, of any Celtic language, in addition to a strong oral tradition of legends and poetry. Poetry in Irish represents the oldest vernacular poetry in Europe, with the earliest examples dating from the 6th century. In more recent times, Ireland has produced four winners of the Nobel Prize for Literature; George Bernard Shaw, William Butler Yeats, Samuel Beckett and Seamus Heaney
