Aonach Beag is a mountain in the Highlands of Scotland with a height of 1234 meters . It is located about 3 km east of Ben Nevis on the north side of Glen Nevis, near the town of Fort William. Apart from Ben Nevis, Aonach Beag is the highest peak in the British Isles outside of the Cairngorm mountains of eastern Scotland and the eight highest mountain in the British Isles.