Truskmore is a Hewitt of 647 m in Sligo. Nothing higher stands within 41.1 km; the nearest higher summit is Cuilcagh (666 m), to the south-east.
It is also on the county tops list, as the highest point of its historic county. Its closest neighbour in this register, Cuilcagh, is 41.1 km away. Its drop of 560 m is 87% of its height: the col linking it to higher ground is only 87 m above sea level. It is one of only two register hills in the Leitrim and W Cavan region, with Cuilcagh. The summit is marked by a trig point.