To the east of Fellbarrow is the Vale of Lorton, through which flows the River Cocker. This is a wide cultivated valley with a number of small parcels of woodland, the settlement of Thackthwaite lying nearest to the fell. To the west are a number of small streams including Mosser Beck and Cat Gill, which also flow northward and ultimately join the Cocker. This is rolling agricultural land on the very edge of the Lake District. North of Fellbarrow is the lower top of Hatteringill Head (1,263 ft), listed in some guidebooks before the ridge falls away over Whin Fell to a minor road known as Mirk Lane. Fellbarrow also sends out a short ridge north eastward over Broadmoor Hill towards Low Lorton village. The fell is rounded and grassy almost throughout.