Slieve Fyagh mountain info maps weather Slieve Fyagh is the 10435th highest peak in the British Isles and the 1001st tallest in Ireland Also known as Sliabh Fioch Elevation 335.0 m (1099 ft) Prominence 198.0 m (650 ft) Category Marilyn Hill / mountain range North Mayo Nearest town OS map sheets OSi50: 023 (Mayo)