Tryfan is a mountain in the Ogwen valley, Snowdonia, Wales. It forms part of the Glyderau group, and is one of the most famous and recognisable peaks in Britain, having a classic pointed shape with rugged crags. At 3,010 feet above sea level it is the fifteenth highest mountain in Wales.
Between the mid-1980s and June 2010, its accepted height was 3,002 ft. However it was resurveyed using accurate GPS measurements and found to be eight feet higher. Until the 1980s, Ordnance Survey maps gave its height as 3,010 ft, and so the new measurement confirms that the earlier survey was correct.
There are many routes of ascent, ranging from easy ridge scrambling, to long mountaineering rock climbs on the east face. Tryfan is the only mountain in Great Britain, apart from the Cuillin of Skye, to require the use of hands (as well as feet) on the ascent. However there are a number of peaks (notably Helm Crag in the Lake District and The Cobbler in the Scottish Highlands) that involve a scramble to reach the highest point.