 Worm Gill is one such watercourse, running south westward from Caw Fell, and forcing the ridge to detour northwards around the head of its valley.Beyond this stand the fells of the Lank Rigg group, the final high country within the National Park.Crag Fell and Grike complete the westward line of the ridge, whilst Lank Rigg itself stands to the south across the head of the River Calder.