Heacla is a Graham of 606.6 m in Na h-Eileanan Siar [Western Isles]. All four of its nearest neighbours are higher, up to Sgurr a' Ghreadaidh at 972.1 m.
Of the 6 register hills in Na h-Eileanan Siar [Western Isles], it has the smallest drop. It is one of only two register hills in the North Uist, South Uist and Nearby Islands region, with Beinn Mhor (Na h-Eileanan Siar [Western Isles]). Only seven of the 737 hills profiled in Scotland are lower. It shares its height of 606.6 m with Cruach nam Miseag. On the Grahams height ladder it sits between Cruach Neuran (607.3 m) and Cruach nam Miseag (606.6 m). Its other name is Thacla] [Hecla.
