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County Donegal is a county located in the west of the Province of Ulster, in the northwest of Ireland. It is one of three counties in the Province of Ulster that does not form part of Northern Ireland. It is the most northern county in all of Ireland, and is part of the Republic of Ireland. County Donegal is the second largest county in Ireland and the largest county in Ulster. The name 'Donegal' comes from the Irish, meaning 'The Fort of the Foreigners'.

Uniquely, Donegal shares a border with only one county in the Republic of Ireland, County Leitrim in north Connacht. The rest of its land border is shared with Northern Ireland (the Northern Irish counties of Londonderry, Tyrone and Fermanagh).

Physically, the county is by far the most rugged and mountainous in Ulster. The county consists chiefly of low mountains, with a deeply indented coastline forming natural loughs, of which both Lough Swilly and Lough Foyle are the most notable. The famous mountains or Hills of Donegal consist of two major ranges, the Derryveagh Mountains in the north and the Bluestack Mountains in the south, with Mount Errigal at 749 metres the highest peak. The Slieve League cliffs are the second highest sea cliffs in Europe, while Donegal's Malin Head is the most northerly point on the island of Ireland.

The climate is temperate and dominated by the Gulf Stream, with cool damp summers and mild wet winters. Two permanently inhabited islands, Arranmore and Tory Island lie off the coast, along with a large number of islands with only transient inhabitants. Ireland's second longest river, the Erne, enters Donegal Bay near the town of Ballyshannon. The River Erne, along with other Donegal waterways, has been dammed to produce hydroelectric power. The River Foyle separates part of County Donegal from parts of both County Londonderry and County Tyrone.

The climate is temperate and dominated by the Gulf Stream, with cool damp summers and mild wet winters. Two permanently inhabited islands, Arranmore and Tory Island lie off the coast, along with a large number of islands with only transient inhabitants. Ireland's second longest river, the Erne, enters Donegal Bay near the town of Ballyshannon. The River Erne, along with other Donegal waterways, has been dammed to produce hydroelectric power. The River Foyle separates part of County Donegal from parts of both County Londonderry and County Tyrone.