 Armboth Fell joins the main ridge via a shallow depression, a little to the south of High Tove, and due east of Middle Crag.This boggy low point is the source of both Fisher Gill and Launchy Gill, which form the fell's northern and southern boundaries respectively.Fisher Gill takes the shorter course, flowing straight for the shore of the reservoir through a break in the conifers below Cockrigg Crag.