Mount Leinster is a Hewitt of 794.4 m in Carlow, Wexford. Nothing higher stands within 44.2 km; the nearest higher summit is Lugnaquillia Mountain (924.7 m), to the north-east.
It is also on the county tops list, as the highest point of its historic county. The key col lies 16.1 km away to the north, at 68 m. Its drop of 726 m is 91% of its height: the col linking it to higher ground is only 68 m above sea level. It overtops all four of its nearest neighbours; the tallest of them, Blackstairs Mountain, reaches 732.1 m. In the database's Waterford, Kilkenny, Carlow region it is the highest of three register hills, above Blackstairs Mountain and Slievenamon. The higher hill nearest to it, Lugnaquillia Mountain, is a 3,000 ft mountain, 44.2 km to the north-east. The summit is marked by a trig point.
