Donegal

In terms of size and area, it is the largest county in Ulster and the fourth-largest county in all of Ireland. Uniquely, County Donegal shares a small border with only one other county in the Republic of Ireland – County Leitrim. The greater part of its land border is shared with three counties of Northern Ireland: County Londonderry, County Tyrone and County Fermanagh.

Irish Times likes Donegal.

This geographic isolation from the rest of the Republic has led to Donegal people maintaining a distinct cultural identity[6] and has been used to market the county with the slogan “Up here it’s different”.[7] While Lifford is the county town, Letterkenny is by far the largest town in the county with a population of 19,588. Letterkenny and the nearby city of Derry form the main economic axis of the northwest of Ireland.[8] Indeed, what became the City of Derry was officially part of County Donegal up until 1610.