Ms. Riley, Three Mile Hill is to the southeast of Strabane. The only current Presbyterian church I can find is in Camus Parish. I would contact the Inn and see if they could help more with the geography.I would be interested in your genealogy as my grandmothers mother was an I(e)rwin.My GGgrandfather was John and had a daughter Lucinda.I don't feel related. Strabane was an area of early migration toAmerica and one of early Elliott history. The Foyle River to west flows through Londonderry to the Sea. It also marks the boundry of the Laggan region of Donegal.You can write me directly if you like.