Ogof
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Ogof Lanciau Eryri
The cave in North Wales where Arthur's men are said to be awaiting his return.
A shepherd was thought to have seen him there, but fled when he almost awakened them.
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Ogof Myrddin
A hill near Carmarthen that is more popularly known as Merlin's Hill.
See also
Bryn Myrddin | The Legend of King Arthur