The venue is an Site of Special Scientific Interest, mainly on account of the ferns that grow here (including some rare tiny varieties of "filmy ferns"). No gardening or route cleaning are permitted and it is a criminal offence to do so without formal consent from Natural Resources Wales. There are also protected bat roosts in the vicinity which are of some concern.
Julian Sykes 10/Aug/1999.
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Grade: E6 6b ***
(Cwm Dimbath)