Aonach Beag is connected via a high bealach to its neighbour Aonach Mor in a ridge that runs north to south. Aonach Beag would by its name translation "small ridge" be assumed to be the smaller hill (in altitude) than Aonach Mor but it is actually larger and the name refers to the bulk size of the hill which Aonach Beag is smaller. Aonach Beag actually boasts better features than its more famous neighbour as its crags on its eastern faces are quite a sight.
Aonach Beag is almost always climbed from the south starting at Glen Nevis. There is also a low col that connects the Aonach Mor - Aonach Beag ridge to Carn Mor Dearg to the west. This gives an ideal opportunity for a multi day expedition with a high camp or bivvy between the two to cover the entire western end of the Nevis Region including Ben Nevis via the Carn Mor Dearg Arête another classic of Scottish mountaineering.