Ben Macdui

Ben Macdui is the second-highest mountain in Scotland and all of the British Isles, after Ben Nevis, and the highest of the Cairngorm Mountains. The summit is 1,309 metres above sea level and it is classed as a Munro. Ben Macdui sits on the southwestern edge of the Cairngorm plateau, overlooking the Lairig Ghru pass to the west, and Loch Etchachan to the east. It lies on the boundary between the historic counties of Aberdeenshire and Banffshire.

Before the production of accurate maps of Scotland in the 19th century, it was not known for certain that Ben Nevis was the highest point in Britain, and it was often thought that Ben Macdui might be higher. Following surveys of both peaks in 1846–47, Ben Nevis was confirmed as the higher.

Source: Wikipedia