Ullscarf is bordered on the west by the Greenup valley, with steep but mainly grassy slopes, the chief exception being Lining Crag.

A series of low tops crown the edge above Nab Crags, one of them bearing a prominent stone structure visible from the valley below.

[1] The main ridge of the Central Fells continues south from Ullscarf, dropping over a field of rocky knolls to cross the wide depression of Greenup Edge.

A second subsidiary ridge extends north-north-west from the summit to Great Crag, passing over the twin tops of Coldbarrow Fell.

[3] A 16th century mine, Launchy Gill Level, was driven 60 ft (18 m) into the fellside below White Crags on the Thirlmere side of the fell.

Bridleways cross the ridge to the north and south of Ullscarf, providing access from Wythburn, Thirlmere, Stonethwaite and Watendlath.

The Wythburn valley (and its bogs) can be followed to reach the ridge at Greenup edge, or more direct climbs can be made via Harrop Tarn.

Ullscarf can be climbed from Watendlath, gaining the north-north-east ridge above Blea Tarn, and then ascending over the tops of Coldbarrow Fell.