Purple Mountain is a Hewitt of 832 m in Kerry. Its drop of 595 m is 72% of its height: the col linking it to higher ground is only 237 m above sea level.
It sits below Knocknapeasta, only 5.1 km to the west and 153.1 m higher. It is one of only three register hills in the Macgillycuddy's Reeks region, with Carrauntoohil and Knocknapeasta. All four of its nearest neighbours lie to the west, so it stands at the eastern edge of its group. It shares its height of 832 m with Cadair Berwyn. On the Hewitts height ladder it sits between Mangerton Mountain (838.2 m) and Cadair Berwyn (832 m). Its nearest higher summit, Cruach Mhor (930.8 m, 4.6 km west), is a listed top not profiled here. The highest point is recorded as shelter, not a cairn. The database describes the top as a shelter.
