MacGillycuddy's Reeks (, meaning the black stacks) is a sandstone and siltstone mountain range in the Iveragh Peninsula in County Kerry, Ireland. Stretching , from the Gap of Dunloe in the east, to Glencar in the west, the Reeks is Ireland's highest mountain range, and includes most of the highest peaks and sharpest ridges in Ireland, and the only peaks on the island over in height.