Cauldron Snout is a dramatic cascade on the upper River Tees in Northern England, sitting immediately below the dam of Cow Green Reservoir on the boundary between County Durham and Cumbria.

Stretching roughly 180 metres (200 yards), it is considered the longest waterfall in England, though it is more accurately described as a cataract than a single plunging drop.

It falls approximately 60 metres over dark Whin Sill basalt, the same hard volcanic rock that shapes much of Upper Teesdale's rugged scenery.

The site lies within the North Pennines Area of Outstanding Natural Beauty and European Geopark, and the Pennine Way passes directly alongside it. Reaching Cauldron Snout requires a walk of around 3 kilometres from the nearest car park at Cow Green Reservoir.

The cascade is at its most powerful and impressive after heavy rainfall, when the volume of water surging through the rock channel becomes genuinely formidable. Some scrambling over rocks is needed to get the best views.