Slieve League, located in County Donegal, Ireland, is one of the most remarkable walks and scenic views in the country. At 601 metres (1,972 feet) tall, it has the second tallest sea cliffs in all of Ireland. The northern side of the mountain, which drops 1500 feet into the surrounding Little Lough Agh, makes for a breathtaking view from the "One Man's Path" - the route that encircles the mountain from beginning to end.