Northern Ireland, which is part of the United Kingdom, is variously defined as a region, province or country. Northern Ireland, situated in the northeast of ireland, shares a southern and western border with the Republic of Ireland. The North Channel, the Irish Sea, and St George's Channel separates Northern Ireland from Great Britain. Ireland is the British Isles' second largest island.
The flag of Ireland is called the Ulster Banner. This is a medieval flag chosen from Northern Ireland 's old Coat of Arms. This flag was later changed into the Saint Patrick's Saltire, named after the patron-saint of Ireland: Saint Patrick. Ireland’s symbol is that of a shamrock. The official colour is green.