Ulster is one of the four provinces of Ireland. Due to large-scale plantations of people from Scotland and England during the 17th and 18th centuries, as well as decades of conflict in the 20th, Ulster has a unique culture, quite different from the rest of Ireland. As all of Northern Ireland lies within Ulster and comprises about 90% of its population, the culture of Northern Ireland is very similar to that of the whole of Ulster. In particular, the Ulster Scots, or Scots Irish identity is strong among descendents of the Plantation, notably in counties Antrim, Cavan, Donegal, and Down. There is also a thriving indigenous Gaelic culture, largely attributed to the GAA and Conradh na Gaeilge.