rhychydwr1
Active member
Learn about the geological features of Wales? Ogof Ffynnon Ddu National Nature Reserve with Dr. Keith Ball, a retired British Geological Survey geologist and life-long speleologist.
https://www.youtube.com/watch?v=Wx_XtDLcWeU
https://www.youtube.com/watch?v=Wx_XtDLcWeU