The eviction is mentioned here and gives several clues as to the area- village of Clonmany, Tullagh and Urrismaud [Urrismanagh] are all mentioned as is the landlord R.B. Harvey.If you go to Google Maps and ask for directions from Clonmany to Tullagh to Urrismanagh and click on terrain option you'll see that the route follows the bottom of the mouth which is called Raghtin More.
Wonder if it is Ba Uachtair (which is the Gaelic for Boyoughter).Lettermacaward (civil parish), Barony of Boylagh.
No, Lettermacaward. http://www.rootschat.com/links/0f88/