Slievenamon is a Hewitt of 720.2 m in Tipperary. No register hill in Tipperary has a greater drop, though Greenane is higher.
Its closest neighbour in this register, Knockanaffrin, is 15.5 km away. Its drop of 642 m is 89% of its height: the col linking it to higher ground is only 78 m above sea level. It is one of only three register hills in the Waterford, Kilkenny, Carlow region, with Mount Leinster and Blackstairs Mountain. All four of its nearest neighbours lie to the south, so it stands at the northern edge of its group. On the Hewitts height ladder it sits between Rhinog Fawr (721 m) and Froswick (720 m). The summit is marked by a trig point.
