An Gearanach has a subsidiary peak, An Garbhanach (rough ridge), which lies 400 metres to the south: the two are connected by a narrow ridge which at one point is quite tricky as it tapers to a knife edge arête dropping into deep glens on either side and requires a good head for heights. There has always been some uncertainty about which is the highest point, with both An Gearanach and An Garbhanach given a height of 3,200 feet on pre metric maps in the 1970s. An Garbhanach reaches a height of 975 metres and in 1921 was accidentally elevated to Munro status and An Gearanach reduced to a top due to the vagaries of old fashioned mapping techniques. The mistake was rectified in the 1933 revision of Munro's tables with an explanation that it had all been a mistake. The northern slopes of An Gearanach require some care when descending from the mountain to Glen Nevis and there have been fatalities as walkers have left the stalkers path and tried to descend directly to Glen Nevis and got into difficulties on the crags above the An Steall Ban waterfall.