The Bluestack Mountains (Na Cruacha Gorma in Irish) are the major mountain range in the south of County Donegal, 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 For other uses, see Donegal (disambiguation) Donegal (Irish: Dún na nGall) is a county in the northwest of Ireland. ... Donegal (Dún na nGall in Irish) is a town in County Donegal, Ireland. ... Ballyshannon (Béal Atha Seanaidh in Irish) is a town in County Donegal, Ireland. ... Dungloe (An Clochán Liath in Irish) is a town in County Donegal, Republic of Ireland, and is the main town in The Rosses. ... Letterkenny (Leitir Ceanainn in Irish) is the largest town in County Donegal in the Republic of Ireland, located 35 miles north of Donegal Town and 20 miles west of Derry in Northern Ireland. ...
Climb Mweelrea, the highest mountain of the West, and the sea is on two sides of you; climb Croaghaun on Achill Island, and it is as if you are on a ship pointing to America, with sea on three sides.
Further west is a wilderness mountain area of crags and lakes, glacial cirques and waterfalls.
Northwest of them are the Galty Mountains, a long range with fine summits, of which Galtymore is the highest and, at 919 metres, one of the highest peaks outside County Kerry.