Tiorga Mor is a Graham of 680 m in Na h-Eileanan Siar [Western Isles]. Its drop is the 9th greatest among the Grahams, behind Sgurr na Coinnich at the top.
Its drop of 589 m is 87% of its height: the col linking it to higher ground is only 91 m above sea level. Of the register hills in Na h-Eileanan Siar [Western Isles], only An Cliseam and Uisgneabhal Mor stand higher. It is one of only four register hills in the Harris and Nearby Islands region, with An Cliseam, Uisgneabhal Mor and Oireabhal. All four of its nearest neighbours lie to the east, so it stands at the western edge of its group. Its other name is Tirga Mor. The summit is marked by a trig point. It falls on two OS 1:50,000 sheets, 13 and 14.
