Slieve Alp mountain info maps weather Slieve Alp is the 10614th highest peak in the British Isles and the 1014th tallest in Ireland Also known as Sliabh Ailp Elevation 329.0 m (1079 ft) Prominence 192.0 m (630 ft) Category Marilyn Hill / mountain range North Mayo Nearest town OS map sheets OSi50: 023 (Mayo)