Hellgill force is a small but impressive waterfall near the start of the River Eden. It is situated where Hell Gill Beck becomes the infant River Eden, just inside the border of Cumbria between Garsdale Head and the Mallerstang Valley. Nearby is Ais Gill Summit, the highest point of the Settle to Carlisle Railway.
The Eden’s source is hidden away, 2198 ft (670m) above sea level, in the moorlands above the Mallerstang Valley, between Wild Boar Fell to the west, and Black Fell Moss to the east. Here two streams, Red Gill and Little Grain, filter from the upland peat of Hugh Seat (2257 ft), and join forces to form Hell Gill Beck.
Hell Gill Beck lies on the border between Cumbria and North Yorkshire, and is also the north western border of the Yorshire Dales National Park.
The waterfall is a single drop fall of around 8 metres (25 feet). It is easy to reach being only a short distance from the B6259 road from Garsdale Head to Kirkby Stephen, at Aisgill Moor Cottages.
From here it is only a short walk past Hellgill House to Hell Gill Bridge on the Pennine Bridleway.
There is a small parking area beside the railway bridge at Aisgill Moor Cottages.