Many of the world's mountaintops may be reached by walking or scrambling up their least steep side. In Great Britain ridge routes which involve some scrambling are especially popular, including Crib Goch on Snowdon, the north ridge of Tryfan, Striding Edge on Helvellyn and Sharp Edge on Blencathra in the Lake District, as well as numerous routes in Scotland such as the Aonach Eagach ridge in Glencoe. Many such routes include a bad step where the scrambling suddenly becomes much more serious.