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On the other side of the valley from Penwyllt almost opposite the cottages,
is the entrance to Dan-yr-Ogof. This is an extensive system, the river
which flows out of Dan-yr-Ogof initially leaves the surface on the Black
Mountain, more than two miles from where it can last be seen in the cave.
The entrance series of Dan-yr-Ogof is a show
cave, but a 10 minute walk through the show cave leads to the start
of the 'cavers cave'. All parties in the cave must have a Dan-yr-Ogof
leader with them - see access details.
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