Ulster's

a geographical region consisting of the northernmost 9 of the 32 counties of Ireland: Armagh, Donegal, Tyrone, Fermanagh, Monaghan, Londonderry/Derry, Antrim, Cavan and Down. Six of those counties (Tyrone, Fermanagh, Armagh, Derry, Antrim and Down) Constitute the political region of Northern Ireland while the other three (Donegal, Monaghan and Cavan) belong to the Republic of Ireland. Although many unionist politicians use the term "Ulster" to refer to "northern Ireland" this is not strictly accurate. In ancient times most of modern day county Louth was also part of Ulster while County Cavan was part of Meath.