On the top of the Greenan mountain, not far from the border of Northern Ireland, lies Grianan of Aileach, one of the finest stone forts in Ireland. From the hill-top there are commanding views over Lough Foyle, Lough Swilly, and Derry, about 8km (5 mi) to the East. The massive stone wall is 3.9m (13ft) thick and encloses an area 23.4m (77ft) in diameter. In the walls are small chambers; a series of stairs at regular intervals inside the walls gave access to the wall-walk. The entrance is very long and lintelled.
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