St Sunday Crag is the high point on the north-eastern ridge of Fairfield, which runs for two miles before descending to the valley floor behind Patterdale village. From the flat Fairfield summit a rough slope descends over the subsidiary top of Cofa Pike to the col at
Deepdale Hause at about . This is a narrow point on the ridge, deeply scarred by pedestrian traffic. The ground now rises again to St Sunday Crag, soaring above the fells on either side. Beyond the summit there is a swift drop to the lower plateau of
Birks and beyond this is the further satellite of
Arnison Crag. The top of St Sunday Crag is triangular in plan with a third ridge running off due east. This crosses a depression (The Cape) before the lower top of Gavel Pike at is reached. From below this is a shapely pyramid worthy of the ‘pike’ designation, although its subsidiarity is all too plain from above. Below Gavel Pike is the further top of Lord's Seat before the short east ridge falls away over rough ground to Deepdale. It is the north-western face above Grisedale that is St Sunday Crag's chief glory. The long graceful curve of the top is set above a wall of crag half a mile long, the whole face being neatly symmetrical. A series of vertical gullies slice through the crags, which together with the intervening ridges provide sport for scramblers and climbers. The crags peter out at about , to be replaced by a steep scree slope falling to the valley floor, a further below. Fine views of this face can be had from
Helvellyn and
Birkhouse Moor across the valley. To the south-east of the fell is the valley of Deepdale, separating St Sunday Crag from
Hart Crag and
Hartsop above How. This face too is steep and rough, although without sustained outcropping of rock. Between Gavel Pike and Birks is Cold Cove, a
hanging valley cut off by Deepdale. All of the becks from St Sunday Crag reach the head of Ullswater at Patterdale. ==Geology==