A steep and rough slope descends north east from the summit of Green Gable, dropping through Mitchell Cove to the flat-topped and rather damp col of Blackmoor Pols 1,995 ft (608 m).

The north western flanks are equally steep, but descending only half the vertical distance into the hanging valley of Gillercomb.

This is the gathering ground of Sour Milk Gill, which drops over a series of falls around the northern extremity of Base Brown.

The top of Base Brown narrows considerably to the north of the summit, a prow-like ridge descending toward the falls of Sour Milk Gill.

[1] Base Brown is often passed on the way to Sty Head and Esk Hause, along the popular paths which start at Seathwaite.

Either the walker can continue up the gill to reach Blackmoor Pols and then make an easy traverse back to the summit, or a direct line can be taken up the north ridge.