Slieve League is a mountain on the Atlantic coast of County Donegal, Ireland. At 594 metres, it has some of the highest sea cliffs on the island of Ireland. Although less famous than the Cliffs of Moher in County Clare, Slieve League's cliffs reach almost three times higher. It has a trig pointed summit and is a designated Marilyn but just below the height required for it to be a Hewitt. A superb mountain to do with world class views.