Arran or the Isle of Arran (; ) is the largest island in the Firth of Clyde, Scotland. With an area of it is the seventh largest Scottish island. It is in the unitary council area of North Ayrshire. In the 2011 census it had a resident population of 4,629. Although it is culturally and physically similar to the Hebrides, it is separated from them by the Kintyre peninsula. Arran is divided into highland and lowland areas by the Highland Boundary Fault and it has been described as a "geologist's paradise".