Crammel Linn is a 7. 6-metre (25-foot) waterfall on the River Irthing, located within the upper section of the Irthing Gorge roughly 3 km from the village of Gilsland.

The gorge stretches for two miles above Gilsland, flanked by sandstone crags and ancient semi-natural woodland, making it one of the most scenic corners of Northumberland.

The falls are reached via an unmanaged moorland path, so the approach can be unpredictable underfoot, but the reward is a secluded pool well suited to wild swimming.

Peregrine falcons and ravens nest near the waterfall, and derelict military structures — likely pump-houses once serving the Blue Streak rocket site at RAF Spadeadam — are visible just upstream, adding an unexpected industrial footnote to the natural setting.