Mweelrea is a Hewitt of 814.5 m in Mayo. It is the highest of the 13 register hills recorded in Mayo; the next is Nephin at 806 m, 8.5 m lower.
Nothing higher stands within 157.3 km; the nearest higher summit is Brandon Far North Top (840.1 m), to the south. It is also on the county tops list, as the highest point of its historic county. In the database's South Mayo and Central Galway region it is the highest of five register hills, above Ben Lugmore and three others. The key col lies 43.8 km away to the east, at 36 m. Its drop is the 8th greatest among the Hewitts, behind Snowdon – Yr Wyddfa at the top. Its drop of 778 m is 96% of its height: the col linking it to higher ground is only 36 m above sea level. It overtops all four of its nearest neighbours; the tallest of them, Ben Lugmore, reaches 803 m. All four of its nearest neighbours lie to the east, so it stands at the western edge of its group.
