All three Buttermere Fells throw out a rocky spur toward the lake, these walls enclosing Birkness and Bleaberry Combs. Birkness Comb, also called Burtness Comb on Ordnance Survey maps, lies between the truncated and unnamed northern ridges of High Crag and High Stile. Drained into Buttermere by Comb Beck, its headwall is rimmed by crags on all sides. Sheepbone Buttress flanks High Crag, which also has a share in Comb Crags, lining the onward ridge. It is the great scooped hollow of the Comb which results in the narrowness of Buttermere Edge. The northern spur also ends abruptly as High Crag Buttress, a further tier of rock lying just above the lakeshore.