The fell has twin summits, Great and Little Sca Fell, with Little Sca Fell, which reaches an elevation of 635 metres (2,083 feet), lying 400 metres north of the main summit across a low col, it has a more substantial cairn and a strange depression which has been augmented by a low wall to make a wind shelter. The summit of Great Sca Fell itself is a broad flat plateau on which the highest point could be located almost at any point within a 15-metre radius, however it has a small cairn to mark the recognised top. Four ridges radiate from the summit to the adjoining fells of Knott (south), Brae Fell (north), Meal Fell (west) and Longlands Fell (north west) making Great Sca Fell strategically important when walking these lonely hills. The River Ellen has its source on the western slopes of Great Sca Fell, flowing westerly to the Solway Firth. Drainage from the east of the fell flows eventually into the River Caldew and then the Eden to again reach the sea at the Solway.