Lifford is the county town of County Donegal, Ireland. It is the administrative capital of the county and the seat of Donegal County Council, although the town of Letterkenny is often mistaken for fulfilling this role.
Lifford lies in the Finn Valley area of East Donegal where the River Finn meets the River Mourne to create the River Foyle. The Burn Deele (also spelled as the Burn Dale), a burn (small river), flows into the River Foyle just north of Lifford.
On the summit of Greenan Mountain is the stone fort known as the Grianán of Aileach. From the site there are spectacular views over Lough Foyle, Lough Swilly and the surrounding countryside. The stone fort is believed to have been constructed during the 8th or 9th century as the seat of Cenél nEógain (branch of the Northern Uí Néill), rulers of the ancient kingdom of Aileach. The interior of the circular fort measures some 23m across and an entrance passage extends through the thickness of the massive encircling wall. This dry-stone wall stands some 5m high and incorporates a series of terraces that are accessed by stone steps.