The Cuillin (Scottish Gaelic: An Cuilthionn (or An Cuiltheann)) are properly and locally known as The Cuillins in the plural, and are a range of rocky mountains located on the Isle of Skye. The true Cuillin is also known as the Black Cuillin to distinguish it from the Red Hills (na Beanntan Dearga) across Glen Sligachan.
Photo credit: Andrewmckie