Northern Ireland (Irish: Tuaisceart Éireann) is a part of the United Kingdom lying in the northeast of the island of Ireland, covering 5,459 square miles (14,139 km², about a sixth of the island's total area). As of the UK Census in April 2001, its population was 1,685,000, between a quarter and a third of the island's total population.
Northern Ireland consists of six of the nine counties of the province of Ulster. In the UK, it is generally known as one of the four Home Nations that form the Kingdom. Some of these terms have controversial implications in relation to political ideologies concerning the constitutional status of Northern Ireland. The remainder of the island of Ireland is a sovereign state, the Republic of Ireland.
As an administrative division of the United Kingdom, Northern Ireland was defined by the Government of Ireland Act, 1920, and has had its own form of devolved government in a similar manner to Scotland and Wales. The Northern Ireland Assembly, established in 1998, has been suspended multiple times but was restored on 8 May 2007. Northern Ireland's legal system descends from the pre-1920 Irish legal system (as does the legal system of the Republic of Ireland), and is therefore based on common law. It is separate from the jurisdictions of England and Wales or Scotland.
Sourced from Wikipedia