Fell Beck
Fell Beck is a stream located near the foot of Ingleborough, in the Yorkshire Dales National Park. It is notable for the fact that it runs into Gaping Gill, the second-largest natural cave shaft in the UK. As it falls down the shaft for 110 metres it is the tallest unbroken waterfall in the UK. It later emerges as Clapham Beck in Beck Head Cave, adjacent to Ingleborough Cave. This was proven by fluorescent dye tests many years ago, but only confirmed by cave divers in the 1983. At times it is blocked off by a temporary dam to allow members of the public to descend the shaft on a winch.
Beyond the village of Clapham, Clapham Beck flows into the River Wenning, which in turn flows into the River Lune and thence to the Irish Sea.
