All the highlights of Grey Knotts are situated on the eastern (Borrowdale) side of the fell, Raven Crag, known as Gillercombe Buttress to rock climbers. It is a popular area for bouldering, using the large number of large boulders that have become detached from the main crag. There are also several conventional climbing routes up the main crag. Gillercomb (spelled like this on map) is a fine example of a hanging valley from which issues the stream of Sour Milk Gill, which descends into Borrowdale in a series of picturesque cascades.