Ballyshannon is a town in County Donegal, Ireland. It is located at the southern end of the county where the N3 from Dublin ends and the N…Ballyshannon is a town in County Donegal, Ireland. It is located at the southern end of the county where the N3 from Dublin ends and the N15 crosses the River Erne. Incorporated in 1613, it is one of the oldest towns in Ireland.