The Wicklow Mountains (, archaic: Cualu) form the largest continuous upland area in Ireland. They occupy the whole centre of County Wicklow and stretch outside its borders into Counties Carlow, Wexford and Dún Laoghaire-Rathdown. Where the mountains extend into County Dún Laoghaire-Rathdown, they are known locally as the Dublin Mountains . The highest peak is Lugnaquilla at .