Carrauntoohil has a deep corrie, known as the Eagle's Nest, at its north-east face, which is accessed from the Hag's Glen, and rises up through three levels. At the top, the third level, is Lough Cummeenoughter, Ireland's highest lake. The Eagle's Nest gives views of the gullies on Carrauntoohil's north-east face: Curved Gully, Central Gully, and Brother O'Shea's Gully. Sometimes the term Eagle's Nest is used to refer to the small stone Mountain Rescue Hut that sits on the first level of the corrie, where the Heavenly Gates descent gully meets the Eagle's Nest corrie.