Bluestack Mountains

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The Bluestack Mountains (Na Cruacha Gorma in Irish) are the major mountain range in the south of County Donegal in western Ulster, Republic of Ireland. They provide an almost impassable barrier between the south of the county, such as Donegal Town and Ballyshannon, and the towns to the north and west such as Dungloe and Letterkenny. The road between the two parts of the county goes through the Barnesmore Gap.