www.donegalcottageholidays.com Letterkenny County Donegal Letterkenny is County Donegal's largest town and is centrally located for touring the major attractions of the northwest. The town has a buzzing nightlife and offers great historical and recreational opportunities for visitors to the area. Poised at the mouth of the deep and lovely Lough Swilly, the town grew in the 17th century from a small fishing village to a prosperous town in Donegal and the Ecclesiastical Seat for the Diocese of Raphoe. Letterkennys name come from the Irish Leitir Ceannain meaning Hillside of the OCanainn clan, the earliest recorded overlords of this Swilly region. Letterkenny is now a busy working town but with all the major amenities needed to allow visitors enjoy a holiday to remember.