Lough Nacung Upper

Lough Nacung Upper (Irish: "Loch na Cuinge Uachtarach" meaning 'Upper Narrowness lake') is a lake in 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 "narrow neck of land (as between two lakes)."
Wildlife.
The main fish species are sea trout and salmon.