Croaghaun is a Hewitt of 690 m in Mayo. Its key col is at sea level, so all 690 m of its height counts as drop.
Nothing higher stands within 34.4 km; the nearest higher summit is Corranabinnia (712 m), to the east. Its closest neighbour in this register, Slievemore, is 9.4 km away. In the database's Achill Island region it is the highest of two register hills, above Slievemore. All four of its nearest neighbours lie to the east, so it stands at the western edge of its group. It shares its height of 690 m with Knocknadobar. On the Hewitts height ladder it sits between Knocknadobar (690 m) and Arenig Fach (688.8 m). It falls on two OS 1:50,000 sheets, 22 and 30.
