Slieve Rushen mountain info maps weather Slieve Rushen is the 8555th highest peak in the British Isles and the 838th tallest in Ireland Also known as Sliabh Roisean Elevation 404.0 m (1325 ft) Prominence 336.0 m (1102 ft) Survey method Abney level Features Knoll Category Marilyn Tump (400-499m) Hill / mountain range Breifne Nearest town OS map sheets OSi50: 027 (Upper Lough Erne)