Ogof Hesp Alyn
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Ogof Hesp Alyn (Welsh for: Dry Alyn Cave) was discovered by [North Wales Caving Club] in 1973 in the Alyn Gorge near Cilcain, Flintshire, North Wales. With more recent discoveries, the length of cave passage totals 2 kilometres extending over a vertical range of about 90m. The entrance would have functioned as a rising prior to the lowering of local water levels by mine drainage. As drainage only took place in the early 20th century, Ogof Hesp Alyn provides a valuable opportunity to study a cave system developed almost entirely by a phreatic processes which remains largely unmodified by vadose streams.
It lies close to another cave, Ogof Hen Ffynhonau, which lies about 150 metres further upstream in the Alyn Gorge. These two caves with Ogof Nadolig form the caves part of the Alyn Valley Woods and Alyn Gorge Caves SSSI.
This cave can be found at:
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