Base Brown stands near the head of the Borrowdale Valley at an elevation of 646 m (2,119 ft), forming one side of the Seathwaite Valley. Its prominence is 38 m (125 ft) and it is listed as a Hewitt, a Nuttall and a Wainwright. It is an outlier of Green Gable, the summit of the north-east ridge which extends out into Borrowdale. Despite being surrounded by crags on both flanks, the summit area is relatively smooth and grassy with a cairn marking the highest point. Base Brown is usually climbed from Seathwaite, often on the way to ascend the higher fells of Green and Great Gable.