Lord's Seat gives birth to a number of streams which, although departing in different directions, all ultimately join the River Derwent. Aiken Beck and its many tributaries drain the south western flanks, most of which are clad in conifers. Hagg Beck, the main feeder of Beck Wythop, begins a little to the north of the summit. This runs across open fellside at first, only entering the trees at around the 1,100 ft contour. Beckstones Gill flows to Bassenthwaite to the south of Barf, while an unnamed stream does the same to the north. All of the eastern flanks of the range are forested, except for the scree-ridden face of Barf between these two watercourses.