The spine of the Central Fells runs north from
High Raise, forming the watershed between
Thirlmere and
Borrowdale. A number of lesser ridges radiate out eastwards from High Raise, centred upon the subsidiary top of
Sergeant Man. One of these runs between the valleys of Far Easedale and Easedale, terminating at their confluence above
Grasmere village. The ridge is narrow to the east of the summit, rising over a series of knolls between the gradually diverging valleys. Westward it broadens considerably, swinging southward around the head of Codale Tarn before becoming indistinct in the general rising ground towards Sergeant Man and the High Raise massif. Codale Tarn is a shallow pool, its original outlet blocked by a
moraine so that it now overflows via a rock lip. The southern flank of the fell comprises Tarn and Greathead Crags, the backdrop to the popular picnic spot of Easedale Tarn. Much larger than Codale, this
tarn is around deep and contains
perch,
eel and
trout. Across the tarn are the crags of
Blea Rigg. On the northern side of the ridge Deer Bields Crag broods over Far Easedale, with
Calf Crag beyond. ==Geology==