Devil's Appendix

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Devil's Appendix
LocationSnowdonia, Wales
Coordinates53°06′35″N 4°02′07″W / 53.109835°N 4.035335°W / 53.109835; -4.035335Coordinates: 53°06′35″N 4°02′07″W / 53.109835°N 4.035335°W / 53.109835; -4.035335
Total height93 metres (305 feet)
WatercourseAfon Ogwen tributary
The Devil's Appendix can be seen as a dark area to the right of the gorge on the right (Twll Du)

The Devil's Appendix 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 to reach the slopes above Llyn Idwal.[1] Depending on flow and the ambient temperature, it can be either an ice climbing route, a single drop waterfall, or a broken waterfall.[2]


  1. ^ Paul Williams, Rock Climbing in Snowdonia, Frances Lincoln, 2006 ISBN 0-7112-2408-0
  2. ^ "Snowdonia". CavingUK. Retrieved 9 September 2009.