The highest waterfall on the River Eden, Hellgill Force, with a drop of about 9.75 metres (according to recent measurements) is just to the north, at grid reference . The river itself rises (at first as Red Gill beck, later becoming Hell Gill beck) below Hugh Seat in the peat bogs above here. It finally becomes the river Eden after merging with the Ais Gill beck, which flows down from Wild Boar Fell.