Northern Ireland is a part of the United Kingdom of Great Britain and Northern Ireland in the north-east of the island of Ireland. It is variously described as a country, province or region of the United Kingdom, amongst other terms. Northern Ireland shares a border to the south and west with the Republic of Ireland. In 2011, its population was 1,810,863, constituting about 30% of the island's total population and about 3% of the UK's population. Since the signing of the Good Friday Agreement in 1998, Northern Ireland is largely self-governing. According to the agreement, Northern Ireland co-operates with the Republic of Ireland on some policy areas, while other areas are reserved for the British Government, though the Republic of Ireland "may put forward views and proposals" with "determined efforts to resolve disagreements between [the two governments]".
Northern Ireland was created in 1921, when Ireland was partitioned between Northern Ireland and Southern Ireland by an act of the British parliament.