 It is the fifth-highest mountain in Leinster after Lugnaquilla , Mullaghcleevaun , Tonelagee , and Cloghernagh , and the highest of the Blackstairs Mountains.A 2RN transmission site tops the peak with a mast height of .The mountain is most often climbed from the Nine Stones, a landmark point at the foot of Mount Leinster, about 8 miles east of Borris.