| Devil's Appendix | |
|---|---|
| Nant Clogwyn y Geifr (Welsh) | |
    | |
| Location | Snowdonia, Wales | 
| Coordinates | 53°06′35″N4°02′07″W / 53.109835°N 4.035335°W | 
| Type | Plunge | 
| Total height | 93 m (305 ft) | 
| Watercourse | Afon Ogwen tributary | 
 The Devil's Appendix (Welsh : Nant Clogwyn y Geifr) [1] is the tallest single-drop waterfall in Wales and one of the tallest in the United Kingdom. It is a plunge style waterfall located on the Clogwyn y Geifr cliffs beside Twll Du in Cwm Idwal, Snowdonia, Wales.
It is formed where a small stream falls for approximately 305 feet (93 metres) to reach the slopes above Llyn Idwal. [2] Depending on flow and the ambient temperature, it can be either an ice climbing route, a single drop waterfall, or a broken waterfall. [3]