enjoy the view

NOTES

www.walkscene.co.uk

a narrow undercliff section of the path early in the walk

Vanishing Streams

Afon Nedd and Afon Mellte - another view of Waterfall Country

Notes and points of interest

Porth yr Ogol the large Car Park on this spot is a popular gathering point for cavers and is well provided with toilets, a shop and picnic tables. A short walk down steps and a rough slope takes you to the fscinating scene of a river flowing into a large cave and disappearing into the darkness. You may see teams of potholers and cavers gointo into the cave, but it is not wise to follow them unless you are with a properly trained and equipped caving team.

Pwll Du the stream that emerges from underground at Pwll Du is such a minor tributory that the Afon Nedd scarcely notices its arrival. But the almost circular bay that this little stream has created is a wonderfukl tribute to the power of water. Definitely a sight worth stopping for.

Pwll-y-rhyd the river Afon Nedd disappears underground at this point only to re-emerge from its gravel bed further downstream (earlier in this walk). In some conditions this vanishing trick happens quite calmly, but at other times is becomes an impressive torrent.

Resurgence is the name applied to the point where an underground stream re-emerges as surface water.

Shake Holes occur often in limestone country and simpy look like random depressions in the ground (sometimes almost cone/funnel shaped). They are points where water seeps into underground systems, gradually dissolving the limestone over years and centuries. Where a stream flows into them they turn into Sink Holes.

Sink Holes are the points where flowing water (river or stream) suddenly disappears into underground systems. They are common features of limestone country and may be almost uneventful points of change or they may be dramatic waterfalls plunging into the darkness below.