known as Bearna an Choimín meaning "gap of the common-land ") is a narrow mountain pass between Macgillycuddy's Reeks (west) and Purple Mountain (east) in County Kerry , Ireland . It is about 11 km (6.8 mi) from north to south. Within it are five lakes: Coosaun Lough, Black Lake, Cushnavally Lake, Auger Lake, and Black