Donegal Bay is an inlet in the northwest of Ireland. Three counties – Donegal to the north and west, Leitrim and Sligo to the south – have shorelines on the bay, which is bounded on the west by the Atlantic Ocean. The town of Donegal and the River Eske lie at the head of the bay.
Donegal Bay is Ireland's largest bay, and also contains Ulster's highest sea cliffs at Slieve League, which tower 1972 ft above sea level.
Donegal Bay's beaches have some of Europe's finest surfing, caused by a combination by a direct west-facing location and the funnel-shape of Donegal Bay. Rossnowlagh and Bundoran are recognised by the European surfing community as among Ireland's finest surf beaches with good facilities and excellent water quality.