Slievemore is a Hewitt of 669 m in Mayo. Its closest neighbour in this register, Croaghaun, is 9.4 km away.
Its drop of 581 m is 87% of its height: the col linking it to higher ground is only 88 m above sea level. It is one of only two register hills in the Achill Island region, with Croaghaun. It shares its height of 669 m with Carnedd y Filiast. On the Hewitts height ladder it sits between Esgeiriau Gwynion (669.9 m) and Carnedd y Filiast (669 m). The summit is marked by a trig point. It falls on two OS 1:50,000 sheets, 22 and 30.
