Slieve Anierin mountain info maps weather Slieve Anierin is the 4054th highest peak in the British Isles and the 311th tallest in Ireland Also known as Sliabh an Iarainn Elevation 585.0 m (1919 ft) Prominence 250.0 m (820 ft) Category Marilyn Arderin Myrddyn Dewey Hill / mountain range Breifne Nearest town OS map sheets OSi50: 026 (Cavan, Fermanagh, Leitrim, Roscommon)