The three most important international airports in the Republic are Dublin Airport, Cork Airport and Shannon Airport. All provide extensive services to the UK, Europe and North America. The Irish national airline Aer Lingus and low-cost operator Ryanair are based at Dublin. Shannon is an important stopover on trans-Atlantic route for refuelling operations. There are several smaller regional airports in the Republic (Galway Airport, Kerry Airport, Knock Airport, Sligo Airport, Waterford Airport) that mostly limit their services to Ireland and the United Kingdom.
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.
A significant recent change to pub culture in Ireland has been the introduction of a smoking ban, in all workplaces, which includes pubs and restaurants. The ban was introduced on 29 March 2004. A majority of the population support the ban, including a significant percentage of smokers. Nevertheless, the atmosphere in pubs has changed greatly as a result, regardless of whether it has boosted or lowered sales, or whether it is a "good thing" or a "bad thing".
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).
A majority of the present-day population are unionist and wish to remain part of the United Kingdom, but a significant minority, known as nationalists, want to see a united Ireland. These two views are linked to deeper cultural divisions. Unionists are predominantly Protestant and often descendants of Scottish and English (mainly Scottish) settlement in previous centuries, while nationalists are predominantly Catholic and usually descend from the Irish population predating such settlement. The conflict between these two sets of identities, including alleged discrimination against nationalists under the Stormont government (1920–72) giving rise to the nationalist "Civil Rights Movement" in the 1960s, and eventually to a long-running conflict known as The Troubles.
Much of the Irish calendar still today reflects the old pagan customs, with later Christian traditions also having significant influence. As in other countries, the date for observing Christmas was deliberately chosen to coincide with the winter solstice. Christmas in Ireland has several local traditions, some in no way connected with Christianity. On 6 January, which is known as "The Little Christmas" (An Nollaig Bhéag) or "The Women's Christmas" (Nollaig na mBan), there is a custom of "Wren boys" who call door to door, in times past, with a dead wren.
Many Irish urban centres developed as garrison towns during the years of British rule and this fact contributed towards their particular character. Another significant factor was the fact thar the Industrial Revolution had a limited impact in Ireland. Belfast had its shipbuilding and a number of towns in Ulster had mechanised linen industries, but the majority of towns developed primarily as commercial and administrative centres. By the end of the 20th century, over 50% of the population lived in these urban areas.
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".