Eagle's Nest and Upper Lake, Killarney, southwest Ireland. The lakes of Killarney are among Ireland's main tourist attractions, nestling among the series of mountains called Macgillycuddy's Reeks. The lakes occupy broad valleys, and the mountains are formed of resistant sandstone. Mild, wet conditions favour the growth of deciduous woodland.

The Gap of Dunloe, Killarney, Ireland, situated in the mountain range called Macgillycuddy's Reeks. Many upland areas were affected by glaciers during the last glacial phase. Upland areas favoured the accumulation of snow and ice owing to their lower temperatures. Small cirque glaciers and larger valley glaciers flowed along pre-existing river valleys, widening and deepening them. In some cases the glacier cut through a mountain range, forming a col or gap such as this.