Beinn Alligin has a great cleft known as Eag Dubh na h-Eighe Achd artificially made by a mining company.
One of the most prominent features of Beinn Alligin is a great cleft known as Eag Dhubh na h-Eigheachd (black gash of the wailing) or Leum na Caillich, which cuts into the ridge south of the summit. It is the scar of the most spectacular rockslide or rock avalanche in Britain, which runs out into the corrie of Toll a' Mhadaidh Mor. 
