Ben Stack is a Graham of 721 m in Highland. Its drop of 531 m is 74% of its height: the col linking it to higher ground is only 190 m above sea level.
All four of its nearest neighbours are higher, up to Foinaven [Foinne Bhein] – Ganu Mor at 911 m. 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 721 m with Ben Cleuch, Rhinog Fawr and Slieve Carr. On the Grahams height ladder it sits between Beinn Bharrain – Mullach Buidhe (721.4 m) and Ben Cleuch (721 m). Its nearest higher summit, Arkle South Top (757.2 m, 5.1 km north-east), is a listed top not profiled here.
