Lough Nacung Upper
Lough Nacung Upper, also known as Upper Lough Nacung, is a lake in Gweedore, a district in the north-west of County Donegal, Ireland. It connects Lough Dunlewey to Lough Nacung Lower, which drains into the Clady River.
Lough Nacung is a Special Area of Conservation.
The name is derived from the Irish cuing, meaning "lake of the isthmus" or "narrow neck of land ".