To the east of Green Crag is a marshy depression before the ground rises again to Harter Fell. The western boundary is formed by the Birker Fell Road, an unenclosed route from Ulpha to Eskdale Green with fine views of the Scafells. Summiting at 885 ft with hairpin climbs at either end, the road is frequently closed in winter by snow and ice. Beyond the road the moorland climbs via Seat How to the summit of Yoadcastle. From here it turns south, forming a more definite ridge on the long march to Black Combe.