Knockastanna mountain info maps weather Knockastanna is the 7487th highest peak in the British Isles and the 681st tallest in Ireland Also known as Cnoc an Stanna Elevation 444.0 m (1457 ft) Prominence 190.0 m (623 ft) Category Marilyn Tump (400-499m) Hill / mountain range Shannon Nearest town OS map sheets OSi50: 066 (Tipperary, Limerick)