The Blue Stack Mountains[1] or Bluestack Mountains, also called the Croaghgorms (Irish: na Cruacha Gorma, meaning 'the blue stacks'), are the major mountain range in the south of County Donegal, Ireland.

The road between the two parts of the county goes through the Barnesmore Gap.

The highest mountain in the range is Croaghgorm, which is 674 metres (2,211 ft) high.

[2] Silver Hill (600 m [2,000 ft]), is the smallest mountain in Ireland to meet the 600 m threshold for a Simms classification.

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