The waterfall is formed where Ashgill Beck drops over a hard layer of Whin Sill dolerite, causing it to undercut the softer underlying shale.
The narrow gorge leading to the falls was formed by glacial meltwater cutting through the bedrock.
Ashgill Force is frequently used by geologists to study the distinct igneous intrusions found throughout the North Pennine region.
The cavern behind the falls was historically noted by local explorers for its collection of varied limestone calcification patterns.
Ashgill Force is a 17-meter high waterfall located on Ashgill Beck in the North Pennines Area of Outstanding Natural Beauty. The falls are situated within a steep-sided limestone gorge, creating a distinctive natural amphitheater. A narrow, slippery path allows visitors to walk behind the waterfall curtain into a small cave, though access depends on water levels. The site features significant geological strata, exposing carboniferous limestone and shale layers. It remains one of the tallest accessible waterfalls in the North Pennines region. The site is maintained as a natural attraction with minimal infrastructure to preserve the rugged character of the river gorge.
From the base of the gorge facing the falls, or from the narrow ledge behind the water curtain for a unique perspective.
Wear sturdy, waterproof hiking boots with high-traction soles as the rocks in the gorge are perpetually wet and slippery.
Bring a waterproof jacket, as walking behind the falls will result in exposure to significant spray.
Exercise extreme caution during or after rainfall, as the gorge is prone to flash flooding and rising water levels.
Do not attempt to walk behind the falls if the water flow appears heavy or high, as the footing is extremely precarious.
Practice leave-no-trace principles; the site is unfenced and requires personal responsibility regarding safety and litter.
