Lugnaquilla (), at , is the 11th–highest peak in Ireland on the Arderin list, and 13th–highest on the Vandeleur-Lynam list, and the highest Irish mountain outside of Kerry. Lugnaquilla is the highest point in Wicklow, and in the province of Leinster. Lugnaquilla is in the Wicklow Mountains, and overlooks the Glen of Imaal to the west and Glenmalure to the east. Naming Irish academic Paul Tempan wrote in his 2010 Irish Hill and Mountain Names, that the summit plateau is marked as Percy's Table, named after an 18th–century local landowner, Colonel Percy. This is similar to Dawson's Table on the summit of Galtymore. Tempan also notes that P.W. Joyce gave the original form as Log na Coilleach, which translates as "hollow of the (grouse) cocks", however, Tempan says that "this seems doubtful". Tempan clarifies the name has no connection with the deity Lug, despite the common use of the term Lug as shorthand for Lugnaquilla, and that in some spellings of the name, several OS maps and guidebooks for example (e.g. Paddy Dillion's guidebooks), an "i" is added to give "Lugnaquillia"; however Tempan settles on "Lugnaquilla" as the proper name for the mountain. Geology The Geological Survey of Ireland ("GSI") describe Lugnaquilla as a "slate capped, granite rooted, relatively flat-topped mountain". Crags of dark-grey schist protrude from the upper cliff walls of Lugnaquilla's corries which are Ordovician in age. The protrusions of lighter grey rock are granite. The cap of schist overlying Lugnaquilla's granite core is the remnant roof of the magma chamber into which the Lugnaquilla granites were emplaced. Cosmogenic dating on exposed bedrock showed that these schists were not covered by ice during the Last Glacial Maximum, and thus Lugnaquilla was a nunatak. Geography Lugnaquilla is described as a "bulky mountain", with a large plateau-type grassy summit (known as Percy's Table), bounded on two sides by steep glacial corries called the "North Prison" (looking into the Glen of Imaal), and the "South Prison" (looking into the glen of the River Ow). On Lugnaquilla's eastern side is the cliff-lined hanging valley of Fraughan Rock Glen, which falls into the glacial U-shaped valley of Glenmalure. Lugnaquilla is the source of the River Slaney. Lugnaquilla does not have a rocky summit or summit ridges, and its large massif is described as a "sprawling mountain moorland". Lug's massif includes several major summits and corrie lakes, often lying in a "horseshoe-shape" with Lug