Knocknapeasta is a 3,000 ft mountain of 985.1 m in Kerry. Only one of the register's Ireland hills is higher.
It is the 5th highest Hewitt. Of the register hills in Kerry, only Carrauntoohil stands higher. It is one of only three register hills in the Macgillycuddy's Reeks region, with Carrauntoohil and Purple Mountain. It is 241.4 m above the average height of the 27 register hills in Kerry. Its other name is Cnoc na Peiste.