Swarth Fell is an approximately 1 mile (1.5 km) stretch of high ground (consisting mainly of limestone capped with millstone grit) situated to the south of Wild Boar Fell, of which it is a continuation. It is mostly within Mallerstang, Cumbria, but the boundary between Cumbria and North Yorkshire (historically Westmorland and the West Riding of Yorkshire) runs along its length, just to the west of the highest points.