Nant Clogwyn y Geifr (English: Devil's Appendix[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.
| Nant Clogwyn y Geifr | |
|---|---|
| Location | Snowdonia, Wales |
| Coordinates | 53.109835°N 4.035335°W / 53.109835; -4.035335 |
| Type | Plunge |
| Total height | 93 m (305 ft) |
| Watercourse | Afon Ogwen tributary |

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]
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| North Wales |
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| Mid Wales | ||
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| South Wales | ||
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