Lugnaquillia Mountain is a 3,000 ft mountain of 924.7 m in Wicklow. It is the highest of the 7 register hills recorded in Wicklow; the next is Mullaghcleevaun at 846.7 m, 78 m lower.
Nothing higher stands within 160.2 km; the nearest higher summit is Snowdon – Yr Wyddfa (1,085 m), to the east. Its drop of 849 m is the 21st greatest of the 1,140 hills here. Only three of the register's Ireland hills are higher. It is also on the county tops list, as the highest point of its historic county. The key col lies 55.5 km away to the north-west, at 76 m. Its closest neighbour in this register, Keadeen Mountain, is 8.0 km away. It counts towards four lists: Hewitts, Furths, Marilyns and county tops. It overtops all four of its nearest neighbours; the tallest of them, Tonelagee, reaches 815.8 m. It stands 271.7 m above its nearest neighbour, Keadeen Mountain, 8.0 km to the west.
