The Coniston (or Furness) Fells form the watershed between Coniston Water and the Duddon valley to the west. The range begins in the north at Wrynose Pass and runs south for around 10 miles before petering out at Broughton in Furness on the Duddon Estuary. Alfred Wainwright in his influential Pictorial Guide to the Lakeland Fells took only the northern half of the range as Lakeland proper, consigning the lower fells to the south to a supplementary work The Outlying Fells of Lakeland. Brim Fell occupies a position in the northern section and therefore qualifies as one of the 214 Wainwrights. Later guidebook writers have chosen to include the whole range in their main volumes.