Cnoc na Deirce Bige mountain info maps weather Cnoc na Deirce Bige is the 10524th highest peak in the British Isles and the 1005th tallest in Ireland Also known as Derkbeg Hill Elevation 332.0 m (1089 ft) Prominence 178.0 m (584 ft) Category Marilyn Hill / mountain range Bluestack Mountains Nearest town OS map sheets OSi50: 011 (Donegal)