However, the names refer to the relative bulk of the mountains when seen from the glen, rather than their altitude above sea level: the summit of Aonach Mòr is in fact 13 metres lower than the summit of Aonach Beag.
Navnet referer dog til de fleste af bjergene set fra dalen, sanerer end deres højde over havets overflade: toppen af Aonach Mèr er i virkeligheden 13 meter lavere end toppen af Aonach Beag.